Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Sep. 30, 2019	Oct. 26, 2019
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Registrant Name	EAGLE MATERIALS INC
Entity Central Index Key	0000918646
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		41,631,496
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Title of 12(b) Security	Common Stock (par value $.01 per share)
Trading Symbol	EXP
Security Exchange Name	NYSE
Entity File Number	1-12984
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	75-2520779
Entity Address, Address Line One	5960 Berkshire Lane
Entity Address, Address Line Two	Suite 900
Entity Address, City or Town	Dallas
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75225
City Area Code	214
Local Phone Number	432-2000
Document Quarterly Report	true
Document Transition Report	false

Consolidated Statements of Earnings (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenue	$ 414,526	$ 381,499	$ 785,123	$ 775,255
Cost of Goods Sold	310,020	283,568	605,288	585,690
Gross Profit	104,506	97,931	179,835	189,565
Equity in Earnings of Unconsolidated Joint Venture	12,357	10,173	21,789	19,424
Corporate General and Administrative Expense	(13,458)	(9,922)	(34,712)	(17,925)
Litigation Settlements and Losses				(1,800)
Other Non-Operating Income	942	428	1,142	999
Interest Expense, Net	(10,137)	(6,817)	(18,983)	(13,449)
Earnings before Income Taxes	94,210	91,793	149,071	176,814
Income Taxes	(22,417)	(19,190)	(35,974)	(37,872)
Net Earnings	$ 71,793	$ 72,603	$ 113,097	$ 138,942
EARNINGS PER SHARE
Basic	$ 1.73	$ 1.54	$ 2.65	$ 2.93
Diluted	$ 1.72	$ 1.53	$ 2.63	$ 2.90
AVERAGE SHARES OUTSTANDING
Basic	41,572,127	47,219,532	42,714,896	47,453,655
Diluted	41,833,775	47,563,818	42,985,715	47,853,472
CASH DIVIDENDS PER SHARE	$ 0.10	$ 0.10	$ 0.20	$ 0.20

Consolidated Statements of Comprehensive Earnings (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net Earnings	$ 71,793	$ 72,603	$ 113,097	$ 138,942
Net Actuarial Change in Defined Benefit Plans:
Amortization of net actuarial loss	43	73	88	146
Tax expense	(10)	(17)	(20)	(34)
Comprehensive Earnings	$ 71,826	$ 72,659	$ 113,165	$ 139,054

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Current Assets -
Cash and Cash Equivalents	$ 53,684	$ 8,601
Accounts and Notes Receivable, net	182,689	128,722
Inventories	241,599	275,194
Income Tax Receivable		5,480
Prepaid and Other Assets	9,083	9,624
Total Current Assets	487,055	427,621
Property, Plant, and Equipment, net	1,456,059	1,426,939
Notes Receivable	6,436	2,898
Investment in Joint Venture	71,662	64,873
Operating Lease Right of Use Assets	63,526
Goodwill and Intangible Assets, net	230,770	229,115
Other Assets	10,703	17,717
Total Assets	2,326,211	2,169,163
Current Liabilities -
Accounts Payable	77,656	80,884
Accrued Liabilities	66,373	61,949
Income Taxes Payable	2,931
Operating Lease Liabilities	11,315
Current Portion of Long-term Debt	36,500	36,500
Total Current Liabilities	194,775	179,333
Long-term Debt	930,426	655,092
Noncurrent Operating Lease Liabilities	56,586
Other Long-term Liabilities	35,371	34,492
Deferred Income Taxes	98,298	90,759
Total Liabilities	1,315,456	959,676
Stockholders’ Equity –
Preferred Stock, Par Value $0.01; Authorized 5,000,000 Shares; None Issued
Common Stock, Par Value $0.01; Authorized 100,000,000 Shares; Issued and Outstanding 41,625,996 and 45,117,393 Shares, respectively	416	451
Capital in Excess of Par Value	2,990
Accumulated Other Comprehensive Losses	(3,248)	(3,316)
Retained Earnings	1,010,597	1,212,352
Total Stockholders’ Equity	1,010,755	1,209,487
Liabilities and Stockholders' Equity, Total	$ 2,326,211	$ 2,169,163

Consolidated Balance Sheets (unaudited) (Parenthetical) - $ / shares	Sep. 30, 2019	Mar. 31, 2019
Statement Of Financial Position [Abstract]
Preferred Stock, Par Value	$ 0.01	$ 0.01
Preferred Stock, Authorized	5,000,000	5,000,000
Preferred Stock, Issued	0	0
Common Stock, Par Value	$ 0.01	$ 0.01
Common Stock, Authorized	100,000,000	100,000,000
Common Stock, Issued	41,625,996	45,117,393
Common Stock, Outstanding	41,625,996	45,117,393

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net Earnings	$ 113,097	$ 138,942
Adjustments to Reconcile Net Earnings to Net Cash Provided by Operating Activities, Net of Effect of Non-Cash Activity -
Depreciation, Depletion, and Amortization	56,333	62,176
Deferred Income Tax Provision	7,520	10,851
Stock Compensation Expense	12,137	7,559
Equity in Earnings of Unconsolidated Joint Venture	(21,789)	(19,424)
Distributions from Joint Venture	15,000	19,500
Changes in Operating Assets and Liabilities:
Accounts and Notes Receivable	(51,242)	(35,894)
Inventories	35,562	19,290
Accounts Payable and Accrued Liabilities	423	(24,399)
Other Assets	9,244	(3,551)
Income Taxes Payable (Receivable)	8,411	(174)
Net Cash Provided by Operating Activities	184,696	174,876
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment	(60,007)	(93,444)
Acquisition Spending	(30,872)
Proceeds from Sale of Property, Plant, and Equipment		2,281
Net Cash Used in Investing Activities	(90,879)	(91,163)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase in Credit Facility	275,000	10,000
Dividends Paid to Stockholders	(8,815)	(9,582)
Purchase and Retirement of Common Stock	(313,887)	(122,404)
Proceeds from Stock Option Exercises	1,767	1,992
Shares Redeemed to Settle Employee Taxes on Stock Compensation	(2,799)	(1,785)
Net Cash Used in Financing Activities	(48,734)	(121,779)
NET INCREASE IN CASH AND CASH EQUIVALENTS	45,083	(38,066)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD	8,601	48,068
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 53,684	$ 10,002

Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Losses [Member]
Beginning balance at Mar. 31, 2018	$ 1,417,690	$ 483	$ 122,379	$ 1,298,840	$ (4,012)
Net Earnings	66,339			66,339
Stock Option Exercises and Restricted Share Vesting	1,992		1,992
Purchase and Retirement of Common Stock	(52,344)	(5)	(52,339)
Dividends to Stockholders	(4,791)			(4,791)
Stock Compensation Expense	3,493	1	3,492
Shares Redeemed to Settle Employee Taxes	(956)		(956)
Unfunded Pension Liability, net of tax	56				56
Ending Balance at Jun. 30, 2018	1,431,479	479	74,568	1,360,388	(3,956)
Beginning balance at Mar. 31, 2018	1,417,690	483	122,379	1,298,840	(4,012)
Net Earnings	138,942
Ending Balance at Sep. 30, 2018	1,432,603	472	7,752	1,428,279	(3,900)
Beginning balance at Jun. 30, 2018	1,431,479	479	74,568	1,360,388	(3,956)
Net Earnings	72,603			72,603
Purchase and Retirement of Common Stock	(70,060)	(7)	(70,053)
Dividends to Stockholders	(4,712)			(4,712)
Stock Compensation Expense	4,066		4,066
Shares Redeemed to Settle Employee Taxes	(829)		(829)
Unfunded Pension Liability, net of tax	56				56
Ending Balance at Sep. 30, 2018	1,432,603	472	7,752	1,428,279	(3,900)
Beginning balance at Mar. 31, 2019	1,209,487	451		1,212,352	(3,316)
Net Earnings	41,304			41,304
Stock Option Exercises and Restricted Share Vesting	396		396
Purchase and Retirement of Common Stock	(198,355)	(23)	(7,748)	(190,584)
Dividends to Stockholders	(4,316)			(4,316)
Stock Compensation Expense	8,219	1	8,218
Shares Redeemed to Settle Employee Taxes	(866)		(866)
Cumulative Effect of Change in Accounting for Leases	(636)			(636)
Unfunded Pension Liability, net of tax	33				33
Ending Balance at Jun. 30, 2019	1,055,266	429		1,058,120	(3,283)
Beginning balance at Mar. 31, 2019	1,209,487	451		1,212,352	(3,316)
Net Earnings	113,097
Ending Balance at Sep. 30, 2019	1,010,755	416	2,990	1,010,597	(3,248)
Beginning balance at Jun. 30, 2019	1,055,266	429		1,058,120	(3,283)
Net Earnings	71,793			71,793
Stock Option Exercises and Restricted Share Vesting	1,371		1,371
Purchase and Retirement of Common Stock	(115,532)	(13)	(366)	(115,153)
Dividends to Stockholders	(4,163)			(4,163)
Stock Compensation Expense	3,918		3,918
Shares Redeemed to Settle Employee Taxes	(1,933)		(1,933)
Unfunded Pension Liability, net of tax	35				35
Ending Balance at Sep. 30, 2019	$ 1,010,755	$ 416	$ 2,990	$ 1,010,597	$ (3,248)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

BASIS OF PRESENTATION

6 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

BASIS OF PRESENTATION

(A) BASIS OF PRESENTATION

The accompanying unaudited consolidated financial statements as of and for the three- and six-month periods ended September 30, 2019 include the accounts of Eagle Materials Inc. and its majority-owned subsidiaries (collectively, the Company, us, or we) and have been prepared by the Company, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K filed with the Securities and Exchange Commission on May 23, 2019.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted pursuant to such rules and regulations, although we believe that the disclosures are adequate to make the information presented not misleading. In our opinion, all adjustments (consisting solely of normal recurring adjustments) necessary to present fairly the information in the following unaudited consolidated financial statements of the Company have been included. The results of operations for interim periods are not necessarily indicative of the results for the full year.

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates.

Recent Accounting Pronouncements

RECENTLY ADOPTED

In February 2016, the Financial Accounting Standards Board (FASB) issued ASU 2016-02, “Leases,” which supersedes existing lease guidance to require lessees to recognize assets and liabilities on the balance sheet for the rights and obligations created by long-term leases and to disclose additional quantitative and qualitative information about leasing arrangements. We adopted the standard on April 1, 2019 using the modified retrospective approach. We also elected the package of practical expedients permitted under the transition guidance which, among other things, allowed us to maintain the historic lease classification for leases in effect at the date of adoption, and to not separate lease components from nonlease components for all leases in effect at the date of adoption. Upon adoption, we recorded a right of use asset of approximately $66.7 million, and operating lease liabilities of approximately $71.1 million. We do not expect the adoption of this standard to materially affect our consolidated statement of earnings or consolidated statement of cash flows. See Footnote (I) for more information.

PENDING ADOPTION

In June 2016, the FASB issued an update on the measurement of credit losses on financial instruments, which requires entities to use a forward-looking approach based on expected losses rather than the current model of incurred losses to estimate credit losses on certain types of financial instruments, including accounts and notes receivable. The application of the forward-looking model may result in earlier recognition of allowances for losses than the current method. This guidance becomes effective for us on April 1, 2020, with early adoption permitted. We are currently assessing the impact of the new standard on our consolidated financial statements and disclosures.

SUPPLEMENTAL CASH FLOW INFORMATION

6 Months Ended

Sep. 30, 2019

Supplemental Cash Flow Elements [Abstract]

SUPPLEMENTAL CASH FLOW INFORMATION

Supplemental cash flow information is as follows:

	For the Six Months Ended September 30,
	2019		2018
	(dollars in thousands)
Cash Payments:
Interest	$	18,196	$	13,855
Income Taxes		19,643		27,390
Operating Cash Flows used for Operating Leases		7,861		—

Non Cash Financing Activities:
Property and Equipment Purchases Included in Accrued Liabilities	$	2,868	$	—

REVENUE

6 Months Ended

Sep. 30, 2019

Revenue From Contract With Customer [Abstract]

REVENUE

(D) REVENUE

We earn Revenue primarily from the sale of products, which include cement, concrete, aggregates, gypsum wallboard, recycled paperboard, and frac sand. The vast majority of Revenue from the sale of cement, concrete, aggregates, and gypsum wallboard are originated by purchase orders from our customers, who are primarily third-party contractors and suppliers. Revenue from our Recycled Paperboard and Oil and Gas Proppants segments is generated primarily through long-term supply agreements that mature between 2019 and 2025. We also earn Revenue from transload services and storage; we recognize Revenue from these services when the product is transferred from the rail car to the truck or silo, or from the silo to the railcar or truck. We invoice customers upon shipment, and our collection terms range from 30-65 days. Revenue from the sale of cement, concrete, aggregates, and gypsum wallboard that is not related to long-term supply agreements is recognized upon shipment of the related products to customers, which is when title and ownership are transferred and the customer is obligated to pay.

Revenue from sales under our long-term supply agreements is also recognized upon transfer of control to the customer, which generally occurs at the time the product is shipped from the production facility or transload location. Our long-term supply agreements with customers define, among other commitments, the volume of product that we must provide and the volume that the customer must purchase by the end of the defined periods. Pricing structures under our agreements are generally market-based but are subject to certain contractual adjustments. Historically, the pricing and volume requirements under certain of these contracts have been renegotiated during volatile market conditions. Shortfall amounts, if applicable under these arrangements, are constrained and not recognized as Revenue until an agreement is reached with the customer and not subject to the risk of reversal. During the quarter ended September 30, 2019, we recognized $1.6 million of revenue related to shortfall provisions in our contracts.

The Company offers certain of its customers, including those with long-term supply agreements, rebates and incentives, which we treat as variable consideration. We adjust the amount of Revenue recognized for the variable consideration using the most likely amount method based on past history and projected volumes in the rebate and incentive period. Any amounts billed to customers for taxes are excluded from Revenue.

The Company has elected to treat freight and delivery charges we pay for the delivery of goods to our customers as a fulfilment activity rather than a separate performance obligation. When we arrange for a third party to deliver products to customers, fees for shipping and handling that are billed to the customer are recorded as Revenue, while costs we incur for shipping and handling are recorded as expenses and included in Cost of Goods Sold.

Other Non-Operating Income includes lease and rental income, asset sale income, non-inventoried aggregates sales income, distribution center income, and trucking income, as well as other miscellaneous revenue items and costs that have not been allocated to a business segment.

See Footnote (O) to the Unaudited Consolidated Financial Statements for disaggregation of revenue by segment.

INVENTORIES

6 Months Ended

Sep. 30, 2019

Inventory Disclosure [Abstract]

INVENTORIES

(G) INVENTORIES

Inventories are stated at the lower of average cost (including applicable material, labor, depreciation, and plant overhead) or net realizable value, and consist of the following:

	September 30,		March 31,
	2019		2019
	(dollars in thousands)
Raw Materials and Materials-in-Progress	$	101,904	$	125,828
Finished Cement		22,062		27,826
Aggregates		7,228		7,351
Gypsum Wallboard		5,587		7,124
Paperboard		11,364		15,660
Frac Sand		2,913		2,557
Repair Parts and Supplies		80,712		80,676
Fuel and Coal		9,829		8,172
	$	241,599	$	275,194

During the six months ended September 30, 2019, we wrote down approximately $2.0 million of raw materials and materials in process and $0.1 million of frac sand. These inventories related to our Oil and Gas Proppants segment.

ACCRUED EXPENSES

6 Months Ended

Sep. 30, 2019

Payables And Accruals [Abstract]

ACCRUED EXPENSES

(H) ACCRUED EXPENSES

Accrued Expenses consist of the following:

	September 30,		March 31,
	2019		2019
	(dollars in thousands)
Payroll and Incentive Compensation	$	21,038	$	26,225
Benefits		14,253		12,673
Interest		3,852		3,852
Property Taxes		8,240		5,058
Power and Fuel		1,502		1,644
Litigation Settlements		—		1,900
Sales and Use Tax		2,033		2,167
Legal and Professional		6,522		—
Other		8,933		8,430
	$	66,373	$	61,949

LEASES

6 Months Ended

Sep. 30, 2019

Leases [Abstract]

LEASES

(I) LEASES

We lease certain real estate, buildings, and equipment, including rail cars. Certain of these leases contain escalations of rent over the term of the lease, as well as options for us to extend the term of the lease at the end of the original term. These extensions range from periods of one year to twenty years. Our lease agreements do not contain material residual value guarantees or material restrictive covenants. In calculating the present value of future minimum lease payments, we use the rate implicit in the lease if it can be determined. Otherwise, we use our incremental borrowing rate in effect at the commencement of the lease to determine the present value of the future minimum lease payments. Additionally, we lease certain equipment under short-term leases with initial terms of less than twelve months, which are not recorded on the balance sheet.

Lease expense for our operating and short-term leases is as follows:


	For the Three Months Ended September 30, 2019		For the Six Months Ended September 30, 2019
	(dollars in thousands)
Operating Lease Cost	$	3,962	$	7,909
Short-term Lease Cost		498		1,082
Total Lease Cost	$	4,460	$	8,991

The Right of Use Assets and Lease Liabilities are reflected on our Balance Sheet as follows:


	For the Six Months Ended September 30, 2019
	(dollars in thousands)
Operating Leases:
Operating Lease Right of Use Assets	$	63,526

Current Operating Lease Liabilities	$	11,315
Noncurrent Operating Lease Liabilities		56,586
Total Operating Lease Liabilities	$	67,901

Future payments for operating leases are as follows (dollars in thousands):


Fiscal Year	Amount
2020 (remaining six months)	$	7,103
2021		12,108
2022		10,618
2023		10,131
2024		8,585
Thereafter		33,579
Total Lease Payments	$	82,124
Less: Imputed Interest		(14,223	)
Present Value of Lease Liabilities	$	67,901

Weighted Average Remaining Lease Term (in years)		8.8
Weighted Average Discount Rate		3.75	%

As disclosed in our March 31, 2019 Form 10-K, future minimum lease payments were as follows (dollars in thousands):


Fiscal Year	Amount
2020	$	14,613
2021		11,487
2022		9,979
2023		9,784
2024		8,347
Thereafter		24,793
Total Lease Payments	$	79,003

SHARE-BASED EMPLOYEE COMPENSATION

6 Months Ended

Sep. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

SHARE-BASED EMPLOYEE COMPENSATION

(J) Share-BASED EMPLOYEE COMPENSATION

On August 7, 2013, our stockholders approved the Eagle Materials Inc. Amended and Restated Incentive Plan (the Plan), which increased the shares we are authorized to issue as awards by 3,000,000 (1,500,000 of which may be stock awards). Under the terms of the Plan, we can issue equity awards, including stock options, restricted stock units (RSUs), restricted stock, and stock appreciation rights to employees of the Company and members of the Board of Directors. Awards that were already outstanding prior to the approval of the Plan on August 7, 2013 remain outstanding. The Compensation Committee of our Board of Directors specifies the terms for grants of equity awards under the Plan.

Long-Term Compensation Plans

OPTIONS

In May 2019, the Compensation Committee of the Board of Directors approved the granting to certain officers and key employees an aggregate of 100,849 performance vesting stock options that will be earned only if certain performance conditions are satisfied (the Fiscal 2020 Employee Performance Stock Option Grant). The performance criteria for the Fiscal 2020 Employee Performance Stock Option Grant is based upon the achievement of certain levels of return on equity (as defined in the option agreements), ranging from 10.0% to 20.0%, for the fiscal year ending March 31, 2020. All stock options will be earned if the return on equity is 20.0% or greater, and the percentage of shares earned will be reduced proportionately to approximately 66.7% if the return on equity is 10.0%. If the Company does not achieve a return on equity of at least 10.0%, all stock options granted will be forfeited. Following any such reduction, restrictions on the earned stock options will lapse ratably over four years, with the initial fourth lapsing promptly following the determination date, and the remaining restrictions lapsing on March 31, 2021 through 2023. The stock options have a term of ten years from the date of grant. The Compensation Committee also approved the granting of 84,043 time-vesting stock options to the same

officers and key employees, which vest ratably over four years (the Fiscal 2020 Employee Time-Vesting Stock Option Grant).

The weighted average assumptions used in the Black-Scholes model to value the option awards in fiscal 2020 are as follows:

	2019
Dividend Yield		1.3	%
Expected Volatility		31.4	%
Risk Free Interest Rate		2.32	%
Expected Life	6.0 years

Stock option expense for all outstanding stock option awards totaled approximately $1.2 million and $2.3 million for the three and six months ended September 30, 2019, respectively, and $1.0 million and $2.0 million for the three and six months ended September 30, 2018, respectively. At September 30, 2019, there was approximately $9.6 million of unrecognized compensation cost related to outstanding stock options, which is expected to be recognized over a weighted average period of 2.7 years.

The following table represents stock option activity for the six months ended September 30, 2019:

	Number of Shares			Weighted Average Exercise Price
Outstanding Options at Beginning of Year		1,042,925		$	76.88
Granted		184,892		$	91.58
Exercised		(37,494	)	$	84.91
Cancelled		(7,883	)	$	106.24
Outstanding Options at End of Year		1,182,440		$	79.94
Options Exercisable at End of Year		776,586		$	73.31
Weighted Average Fair Value of Options Granted During the Year				$	27.37

The following table summarizes information about stock options outstanding at September 30, 2019:

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Number of Shares Outstanding		Weighted Average Remaining Contractual Life (in years)		Weighted Average Exercise Price		Number of Shares Outstanding		Weighted Average Exercise Price
$23.17 - $29.84		65,912		1.85	$	23.27		65,912	$	23.27
$33.43 - $37.34		57,728		2.71	$	34.03		57,728	$	34.03
$53.22 - $77.67		292,595		5.77	$	71.51		228,423	$	71.35
$79.73 - $106.24		766,205		7.25	$	91.49		424,523	$	87.47
		1,182,440		6.36	$	79.94		776,586	$	73.31

At September 30, 2019, the aggregate intrinsic value for both of the outstanding and exercisable options was approximately $15.4 million. The total intrinsic value of options exercised during the six months ended September 30, 2019 was approximately $1.4 million.

RESTRICTED STOCK

In May 2019, the Compensation Committee approved the granting to certain officers and key employees an aggregate of 51,112 shares of performance vesting restricted stock that will be earned if certain performance conditions are satisfied (the Fiscal 2020 Employee Restricted Stock Performance Award). The performance criteria for the Fiscal 2020 Employee Restricted Stock Performance Award is based upon the achievement of certain levels of return on equity (as defined in the award agreement), ranging from 10.0% to 20.0%, for the fiscal year ending March 31, 2020. All restricted shares will be earned if the return on equity is 20.0% or greater, and the percentage of shares earned will be reduced proportionately to approximately 66.7% if the return on equity is 10.0%. If the Company does not achieve a return on equity of at least 10.0%, all awards will be forfeited. Following any such reduction, restrictions on the earned shares will lapse ratably over four years, with the initial

fourth lapsing promptly following the determination date, and the remaining restrictions lapsing on March 31, 2021 through 2023. The Compensation Committee also approved the granting of 42,591 shares of time-vesting restricted stock to the same officers and key employees, which vest ratably over four years (the Fiscal 2020 Employee Restricted Stock Time-Vesting Award). The Fiscal 2020 Employee Restricted Stock Performance Award and the Fiscal 2020 Employee Restricted Stock Time-Vesting Award were valued at the closing price of the stock on the date of grant and are being expensed over a four-year period.

In August 2019, we granted 24,589 shares of restricted stock to members of the Board of Directors (the Board of Directors Fiscal 2020 Restricted Stock Award), which vest six months after the grant date. The Board of Directors Fiscal 2020 Restricted Stock Award was valued at the closing price of the stock at the date of the grant and is being expensed over a six-month period.

The fair value of restricted stock is based on the stock price at the date of grant. The following table summarizes the activity for nonvested restricted shares during the six months ended September 30, 2019:

	Number of Shares			Weighted Average Grant Date Fair Value
Restricted Stock Beginning of Year		300,115		$	78.94
Granted		118,292		$	90.08
Vested		(78,307	)	$	97.88
Forfeited		(15,940	)	$	106.24
Nonvested Restricted Stock at End of Year		324,160

Expense related to restricted shares was approximately $2.7 million and $9.8 million for the three and six months ended September 30, 2019, respectively, and $3.1 million and $5.5 million for the three and six months ended September 30, 2018, respectively. At September 30, 2019, there was approximately $18.4 million of unearned compensation from restricted stock, which will be recognized over a weighted average period of 2.2 years.

The number of shares available for future grants of stock options, restricted stock units, stock appreciation rights, and restricted stock under the Plan was 3,756,577 at September 30, 2019.

COMPUTATION OF EARNINGS PER SHARE

6 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

COMPUTATION OF EARNINGS PER SHARE

(K) COMPUTATION OF EARNINGS PER SHARE

The calculation of basic and diluted common shares outstanding is as follows:

	For the Three Months Ended September 30,						For the Six Months Ended September 30,
	2019			2018			2019			2018
Weighted Average Shares of Common Stock Outstanding		41,572,127			47,219,532			42,714,896			47,453,655
Effect of Dilutive Shares:
Assumed Exercise of Outstanding Dilutive Options		649,394			785,848			700,024			807,861
Less Shares Repurchased from Proceeds of Assumed Exercised Options		(509,571	)		(588,900	)		(550,609	)		(580,350	)
Restricted Stock Units		121,825			147,338			121,404			172,306
Weighted Average Common Stock and Dilutive Securities Outstanding		41,833,775			47,563,818			42,985,715			47,853,472
Shares Excluded Due to Anti-dilution Effects		448,354			181,412			388,058			163,450

PENSION AND EMPLOYEE BENEFIT PLANS

6 Months Ended

Sep. 30, 2019

Compensation And Retirement Disclosure [Abstract]

PENSION AND EMPLOYEE BENEFIT PLANS

(L) PENSION AND EMPLOYEE BENEFIT PLANS

We sponsor several defined benefit pension plans and defined contribution plans, which together cover substantially all our employees. Benefits paid under the defined benefit plans covering certain hourly employees are based on years of service and the employee’s qualifying compensation over the last few years of employment.

The following table shows the components of net periodic cost for our plans:

	For the Three Months Ended September 30,						For the Six Months Ended September 30,
	2019			2018			2019			2018
	(dollars in thousands)
Service Cost - Benefits Earned During the Period	$	85		$	100		$	170		$	200
Interest Cost of Projected Benefit Obligation		338			337			675			674
Expected Return on Plan Assets		(426	)		(463	)		(853	)		(926	)
Recognized Net Actuarial Loss		43			58			88			116
Amortization of Prior-Service Cost		—			15			—			30
Net Periodic Pension Cost	$	40		$	47		$	80		$	94

LONG-TERM DEBT

6 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

LONG-TERM DEBT

(N) LONG-TERM DEBT

Long-term Debt consists of the following:

	September 30,			March 31,
	2019			2019
	(dollars in thousands)
Bank Credit Facility	$	585,000		$	310,000
4.500% Senior Unsecured Notes Due 2026		350,000			350,000
Private Placement Senior Unsecured Notes		36,500			36,500
Total Debt		971,500			696,500
Less: Current Portion of Long-term Debt		(36,500	)		(36,500	)
Less: Debt Origination Costs		(4,574	)		(4,908	)
Long-term Debt	$	930,426		$	655,092

Credit Facility

We have a revolving credit facility (the Credit Facility) that terminates on August 2, 2021. During May 2019, we exercised our option to expand the Credit Facility and increased the borrowing capacity from $500.0 million to $750.0 million. The Credit Facility also includes a swingline loan sublimit of $25.0 million, which terminates on August 2, 2021. Borrowings under the Credit Facility are guaranteed by substantially all of the Company’s subsidiaries. The debt under the Credit Facility is not rated by ratings agencies.

At our option, outstanding principal amounts on the Credit Facility bear interest at a variable rate equal to either (i) the London Interbank Offered Rate (LIBOR) plus an agreed margin (ranging from 100 to 225 basis points), which is to be established quarterly based on the Company’s ratio of consolidated EBITDA, defined as earnings before interest, taxes, depreciation, and amortization, to the Company’s consolidated indebtedness (the Leverage Ratio); or (ii) an alternative base rate which is the higher of (a) the prime rate or (b) the federal funds rate

plus ¹⁄₂% per annum plus an applicable rate (ranging from 0 to 125 basis points). In the case of loans bearing interest at a rate based on the federal funds rate, interest payments are payable quarterly. In the case of loans bearing interest at a rate based on LIBOR, interest is payable at the end of the LIBOR advance periods, which can be up to nine months at the option of the Company. The Company is also required to pay a commitment fee on unused available borrowings under the Credit Facility ranging from 10 to 35 basis points depending upon the Leverage Ratio. The Credit Facility contains customary covenants that restrict our ability to incur additional debt; encumber our assets; sell assets; make or enter into certain investments, loans, or guaranties; and enter into sale and leaseback arrangements. The Credit Facility also requires us to maintain a consolidated indebtedness ratio (calculated as consolidated indebtedness to consolidated earnings before interest, taxes, depreciation, amortization, certain transaction-related deductions, and other non-cash deductions) of 3.5:1.0 or less and an interest coverage ratio (consolidated earnings before interest, taxes, depreciation, amortization, certain transaction-related deductions, and other non-cash deductions to consolidated interest expense) of at least 2.5:1.0. We were in compliance with all financial ratios and tests at September 30, 2019. We had $585.0 million of borrowings outstanding at September 30, 2019. Based on our Leverage Ratio, we had $158.1 million of available borrowings, net of the outstanding letters of credit, at September 30, 2019.

The Credit Facility has a $40.0 million letter of credit facility. Under the letter of credit facility, the Company pays a fee at a per annum rate equal to the applicable margin for Eurodollar loans in effect from time to time plus a one-time letter of credit fee in an amount equal to 0.125% of the initial stated amount. At September 30, 2019, we had $6.9 million of outstanding letters of credit.

4.500% Senior Unsecured Notes Due 2026

On August 2, 2016, the Company issued $350.0 million aggregate principal amount of 4.500% senior notes (Senior Unsecured Notes) due August 2026. Interest on the Senior Unsecured Notes is payable semiannually on February 1 and August 1 of each year until all of the outstanding notes are paid. The Senior Unsecured Notes rank equal to existing and future senior indebtedness, including the Credit Facility and the Private Placement Senior Unsecured Notes. Prior to August 1, 2021, we may redeem some or all of the Senior Unsecured Notes at a price equal to 100% of the principal amount, plus a “make-whole” premium. Beginning August 1, 2021, we may redeem some or all of the Senior Unsecured Notes at the redemption prices set forth below (expressed as a percentage of the principal amount being redeemed):

	Percentage
2021		102.25	%
2022		101.50	%
2023		100.75	%
2024 and thereafter		100.00	%

The Senior Unsecured Notes contain covenants that limit our ability and/or our guarantor subsidiaries' ability to create or permit to exist certain liens; enter into sale and leaseback transactions; and consolidate, merge, or transfer all or substantially all of our assets. The Company’s Senior Unsecured Notes are fully, unconditionally, jointly, and severally guaranteed by each of our subsidiaries that are guarantors under the Credit Facility and Private Placement Senior Unsecured Notes. See Footnote (S) for more information on the guarantors of the Senior Public Notes.

Private Placement Senior Unsecured Notes

On October 2, 2007, in a private placement transaction, we entered into a Note Purchase Agreement (the 2007 Note Purchase Agreement) in connection with our sale of $200.0 million of senior unsecured notes, designated as Series 2007A Senior Notes (the Series 2007A Senior Unsecured Notes). The Series 2007A Senior Unsecured Notes, which are guaranteed by substantially all of our subsidiaries, were sold at par and issued in four tranches.

At September 30, 2019, the amount outstanding for the remaining tranche is as follows:

		Principal		Maturity Date		Interest Rate
Tranche D		$36.5 million		October 2, 2019			6.48	%

Interest for the Series 2007A Senior Unsecured Notes is payable semi-annually April 2 and October 2 of each year until all principal is paid for the respective tranche. On October 2, 2019, we repaid all outstanding notes related to the Private Placement Unsecured Notes.

Other Information

We lease one of our cement plants from the city of Sugar Creek, Missouri. The city of Sugar Creek issued industrial revenue bonds to partly finance improvements to the cement plant. The lease payments due to the city of Sugar Creek under the cement plant lease, which was entered into upon the sale of the industrial revenue bonds, are equal in amount to the payments required to be made by the city of Sugar Creek to the holders of the industrial revenue bonds. Because we hold all outstanding industrial revenue bonds, no debt is reflected on our financial statements in connection with our lease of the cement plant. Upon expiration of the lease in fiscal 2021, we have the option to purchase the cement plant for a nominal amount.

SEGMENT INFORMATION

6 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

SEGMENT INFORMATION

(O) SEGMENT INFORMATION

Operating segments are defined as components of an enterprise that engage in business activities that earn revenue, incur expenses, and prepare separate financial information that is evaluated regularly by our chief operating decision maker in order to allocate resources and assess performance.

We are a leading supplier of heavy construction materials, light building materials, and materials used for oil and natural gas extraction in the United States. Our products are commodities that are essential in commercial and residential construction; public construction projects; projects to build, expand, and repair roads and highways; and in oil and natural gas extraction.

Our business is organized into three sectors within which there are five reportable business segments. The Heavy Materials sector includes the Cement and Concrete and Aggregates segments. The Light Materials sector includes the Gypsum Wallboard and Recycled Paperboard segments. The Oil and Gas Proppants segment produces frac sand used in oil and gas extraction.

Our operations are conducted in the U.S. and include the mining of limestone for the manufacture, production, distribution, and sale of portland cement (a basic construction material, which is the essential binding ingredient in concrete); the grinding and sale of slag; the mining of gypsum for the manufacture and sale of gypsum wallboard; the manufacture and sale of recycled paperboard to the gypsum wallboard industry and other paperboard converters; the sale of readymix concrete; and the mining and sale of aggregates (crushed stone, sand, and gravel) and sand used in hydraulic fracturing (frac sand).

We operate seven modern cement plants (one of which is operated through a joint venture located in Buda, Texas), one slag grinding facility and 19 cement distribution terminals. Our cement companies focus on the U.S. heartland and operate as an integrated network selling product primarily in California, Colorado, Illinois, Iowa, Missouri, Nebraska, Nevada, Ohio, Oklahoma, and Texas. We operate 25 readymix concrete batch plants and five aggregates processing plants in markets that are complementary to our cement network.

We operate five gypsum wallboard plants and a recycled paperboard mill. Gypsum wallboard and recycled paperboard are distributed throughout the continental U.S., with the exception of the Northeast.

Our Oil and Gas Proppants business owns two frac sand processing facilities, four frac sand drying facilities, and five frac sand trans-load locations. Frac sand is currently sold into shale deposits across the United States.

We account for intersegment sales at market prices. For segment reporting purposes only, we proportionately consolidate our 50% share of the Joint Venture’s Revenue and Operating Earnings, consistent with the way management reports the segments within the Company for making operating decisions and assessing performance.

The following table sets forth certain financial information relating to our operations by segment. We do not allocate interest or taxes at the segment level; these costs are disclosed at the consolidated company level.

	For the Three Months Ended September 30,						For the Six Months Ended September 30,
	2019			2018			2019			2018
	(dollars in thousands)
Revenue -
Cement	$	227,013		$	193,161		$	422,326		$	379,949
Concrete and Aggregates		55,971			39,744			95,749			80,584
Gypsum Wallboard		128,660			129,609			255,384			272,024
Paperboard		41,847			41,277			84,547			86,410
Oil and Gas Proppants		13,957			23,466			29,189			51,166
		467,448			427,257			887,195			870,133
Less: Intersegment Revenue		(23,034	)		(20,279	)		(44,679	)		(42,135	)
Less: Joint Venture Revenue		(29,888	)		(25,479	)		(57,393	)		(52,743	)
	$	414,526		$	381,499		$	785,123		$	775,255

	For the Three Months Ended September 30,				For the Six Months Ended September 30,
	2019		2018		2019		2018
	(dollars in thousands)
Intersegment Revenue -
Cement	$	6,703	$	4,073	$	10,956	$	8,251
Concrete and Aggregates		407		501		784		832
Paperboard		15,924		15,705		32,939		33,052
	$	23,034	$	20,279	$	44,679	$	42,135
Cement Sales Volume (M tons) -
Wholly Owned		1,529		1,339		2,847		2,614
Joint Venture		249		218		481		454
		1,778		1,557		3,328		3,068

	For the Three Months Ended September 30,						For the Six Months Ended September 30,
	2019			2018			2019			2018
	(dollars in thousands)
Operating Earnings -
Cement	$	66,526		$	57,547		$	102,647		$	94,881
Concrete and Aggregates		7,255			4,100			11,689			9,584
Gypsum Wallboard		38,456			45,671			76,388			96,151
Paperboard		10,095			8,609			20,039			18,603
Oil and Gas Proppants		(5,469	)		(7,823	)		(9,139	)		(10,230	)
Sub-Total		116,863			108,104			201,624			208,989
Corporate General and Administrative Expense		(13,458	)		(9,922	)		(34,712	)		(17,925	)
Litigation Settlements and Losses		—			—			—			(1,800	)
Other Non-Operating Income		942			428			1,142			999
Earnings Before Interest and Income Taxes		104,347			98,610			168,054			190,263
Interest Expense, net		(10,137	)		(6,817	)		(18,983	)		(13,449	)
Earnings Before Income Taxes	$	94,210		$	91,793		$	149,071		$	176,814
Cement Operating Earnings -
Wholly Owned	$	54,169		$	47,374		$	80,858		$	75,457
Joint Ventures		12,357			10,173			21,789			19,424
	$	66,526		$	57,547		$	102,647		$	94,881
Capital Expenditures -
Cement	$	8,209		$	14,220		$	18,746		$	33,833
Concrete and Aggregates		5,496			459			6,091			2,523
Gypsum Wallboard		6,443			4,124			8,374			6,479
Paperboard		17,239			5,345			29,599			6,410
Oil and Gas Proppants		—			14,917			65			42,866
Corporate and Other		—			1,306			—			1,333
	$	37,387		$	40,371		$	62,875		$	93,444
Depreciation, Depletion, and Amortization -
Cement	$	13,868		$	12,746		$	28,086		$	25,667
Concrete and Aggregates		2,754			2,052			4,945			4,105
Gypsum Wallboard		5,147			5,201			10,099			10,031
Paperboard		2,203			2,128			4,366			4,237
Oil and Gas Proppants		3,803			9,851			7,642			17,446
Corporate and Other		598			348			1,195			690
	$	28,373		$	32,326		$	56,333		$	62,176

	September 30,		March 31,
	2019		2019
	(dollars in thousands)
Identifiable Assets
Cement	$	1,312,488	$	1,289,468
Concrete and Aggregates		149,351		95,084
Gypsum Wallboard		368,088		372,206
Paperboard		159,457		138,614
Oil and Gas Proppants		258,739		236,357
Other, net		78,088		37,434
	$	2,326,211	$	2,169,163

The capital expenditures for the six months ended September 30, 2019 disclosed above differs from the capital expenditures on the Unaudited Consolidated Statement of Cash Flows. It includes $2.9 million of capital expenditures that were accrued at September 30, 2019 and therefore is not included in the Statement of Cash Flows. See Footnote (C) for more information.

Segment operating earnings, including the proportionately consolidated 50% interest in the revenue and expenses of the Joint Venture, represent Revenue, less direct operating expenses, segment Depreciation, and segment Selling, General and Administrative expenses. We account for intersegment sales at market prices. Corporate assets consist primarily of cash and cash equivalents, general office assets, and miscellaneous other assets.

The basis used to disclose Identifiable Assets; Capital Expenditures; and Depreciation, Depletion, and Amortization conforms with the equity method, and is similar to how we disclose these accounts in our Unaudited Consolidated Balance Sheets and Unaudited Consolidated Statements of Earnings

The segment breakdown of Goodwill is as follows:

	September 30,		March 31,
	2019		2019
	(dollars in thousands)
Cement	$	74,214	$	74,214
Gypsum Wallboard		116,618		116,618
Paperboard		7,538		7,538
Concrete and Aggregates		1,639		—
	$	200,009	$	198,370

Summarized financial information for the Joint Venture that is not consolidated is set out below (this summarized financial information includes the total amount for the Joint Venture and not our 50% interest in those amounts):

	For the Three Months Ended September 30,				For the Six Months Ended September 30,
	2019		2018		2019		2018
	(dollars in thousands)
Revenue	$	59,775	$	51,859	$	115,617	$	107,510
Gross Margin	$	26,191	$	21,877	$	46,056	$	42,018
Earnings Before Income Taxes	$	24,713	$	20,345	$	43,577	$	38,849

	September 30,		March 31,
	2019		2019
	(dollars in thousands)
Current Assets	$	80,794	$	71,688
Non-Current Assets	$	86,523	$	81,007
Current Liabilities	$	18,863	$	19,309

INTEREST EXPENSE

6 Months Ended

Sep. 30, 2019

Banking And Thrift Interest [Abstract]

INTEREST EXPENSE

(P) INTEREST EXPENSE

The following components are included in Interest Expense, net:

	For the Three Months Ended September 30,						For the Six Months Ended September 30,
	2019			2018			2019			2018
	(dollars in thousands)
Interest Income		(7	)	$	(110	)		(11	)	$	(112	)
Interest Expense		9,861			6,660			18,432			13,002
Other Expenses		283			267			562			559
Interest Expense, net	$	10,137		$	6,817		$	18,983		$	13,449

Interest Income includes interest on investments of excess cash. Components of Interest Expense include interest associated with the Credit Facility, Senior Unsecured Notes, Private Placement Senior Unsecured Notes, and commitment fees based on the unused portion of the Credit Facility. Other Expenses include amortization of debt issuance costs and credit facility costs.

FAIR VALUE OF FINANCIAL INSTRUMENTS

6 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

FAIR VALUE OF FINANCIAL INSTRUMENTS

(R) FAIR VALUE OF FINANCIAL INSTRUMENTS

The fair value of our long-term debt has been estimated based upon our current incremental borrowing rates for similar types of borrowing arrangements. The fair value of our Senior Unsecured Notes and Private Placement Senior Unsecured Notes at September 30, 2019 is as follows:

	Fair Value
	(dollars in thousands)
Series 2007A Tranche D	$	36,508
4.500% Senior Unsecured Notes Due 2026	$	365,032

The estimated fair values were based on quoted prices of similar debt instruments with similar terms that are publicly traded (level 2 input). The carrying values of Cash and Cash Equivalents, Restricted Cash, Accounts and Notes Receivable, Accounts Payable, and Accrued Liabilities approximate their fair values at September 30, 2019 due to the short-term maturities of these assets and liabilities. The fair value of our Credit Facility also approximates its carrying value at September 30, 2019.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

FINANCIAL STATEMENTS FOR GUARANTORS OF THE 4.500% SENIOR UNSECURED NOTES

6 Months Ended

Sep. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

FINANCIAL STATEMENTS FOR GUARANTORS OF THE 4.500% SENIOR UNSECURED NOTES

(S) FINANCIAL STATEMENTS FOR GUARANTORS OF THE 4.500% SENIOR UNSECURED NOTES

On August 2, 2016, the Company completed a public offering of its Senior Unsecured Notes. The Senior Unsecured Notes are senior unsecured obligations of the Company and were offered under the Company’s existing shelf registration statement filed with the Securities and Exchange Commission.

The Senior Unsecured Notes are guaranteed by all of the Company’s wholly owned subsidiaries, and all guarantees are full and unconditional, and joint and several. The following unaudited condensed consolidating financial statements present separately the Earnings and Comprehensive Earnings, financial position and Cash Flows of the parent issuer (Eagle Materials Inc.) and the guarantors (all wholly owned subsidiaries of Eagle Materials Inc.) on a combined basis with eliminating entries (dollars in thousands).

Condensed Consolidating Statement of Earnings and Comprehensive Earnings For the Three Months Ended September 30, 2019	Parent			Guarantor Subsidiaries			Eliminations			Consolidated
Revenue	$	—		$	414,526		$	—		$	414,526
Cost of Goods Sold		—			310,020			—			310,020
Gross Profit		—			104,506			—			104,506
Equity in Earnings of Unconsolidated Joint Venture		12,357			12,357			(12,357	)		12,357
Equity in Earnings of Subsidiaries		79,981			—			(79,981	)		—
Corporate General and Administrative Expenses		(12,958	)		(500	)		—			(13,458	)
Other Non-Operating Income		(19	)		961			—			942
Interest Expense, net		(10,124	)		(13	)		—			(10,137	)
Earnings before Income Taxes		69,237			117,311			(92,338	)		94,210
Income Taxes		2,556			(24,973	)		—			(22,417	)
Net Earnings	$	71,793		$	92,338		$	(92,338	)	$	71,793
Net Earnings	$	71,793		$	92,338		$	(92,338	)	$	71,793
Net Actuarial Change in Benefit Plans, net of tax		33			33			(33	)		33
Comprehensive Earnings	$	71,826		$	92,371		$	(92,371	)	$	71,826

Condensed Consolidating Statement of Earnings and Comprehensive Earnings For the Three Months Ended September 30, 2018	Parent			Guarantor Subsidiaries			Eliminations			Consolidated
Revenue	$	—		$	381,499		$	—		$	381,499
Cost of Goods Sold		—			283,568			—			283,568
Gross Profit		—			97,931			—			97,931
Equity in Earnings of Unconsolidated Joint Venture		10,173			10,173			(10,173	)		10,173
Equity in Earnings of Subsidiaries		75,030			—			(75,030	)		—
Corporate General and Administrative Expenses		(9,090	)		(832	)		—			(9,922	)
Other Non-Operating Income		(126	)		554			—			428
Interest Expense, net		(6,806	)		(11	)		—			(6,817	)
Earnings before Income Taxes		69,181			107,815			(85,203	)		91,793
Income Taxes		3,421			(22,611	)		—			(19,190	)
Net Earnings	$	72,602		$	85,204		$	(85,203	)	$	72,603
Net Earnings	$	72,603		$	85,204		$	(85,203	)		72,603
Net Actuarial Change in Benefit Plans, net of tax		56			56			(56	)		56
Comprehensive Earnings	$	72,659		$	85,260		$	(85,259	)	$	72,659

Condensed Consolidating Statement of Earnings and Comprehensive Earnings For the Six Months Ended September 30, 2019	Parent			Guarantor Subsidiaries			Eliminations			Consolidated
Revenue	$	—		$	785,123		$	—		$	785,123
Cost of Goods Sold		—			605,288			—			605,288
Gross Profit		—			179,835			—			179,835
Equity in Earnings of Unconsolidated Joint Venture		21,789			21,789			(21,789	)		21,789
Equity in Earnings of Subsidiaries		135,723			—			(135,723	)		—
Corporate General and Administrative Expenses		(33,926	)		(786	)		—			(34,712	)
Other Non-Operating Income		407			735			—			1,142
Interest Expense, net		(18,958	)		(25	)		—			(18,983	)
Earnings before Income Taxes		105,035			201,548			(157,512	)		149,071
Income Taxes		8,062			(44,036	)		—			(35,974	)
Net Earnings	$	113,097		$	157,512		$	(157,512	)	$	113,097
Net Earnings	$	113,097		$	157,512		$	(157,512	)	$	113,097
Net Actuarial Change in Benefit Plans, net of tax		68			68			(68	)		68
Comprehensive Earnings	$	113,165		$	157,580		$	(157,580	)	$	113,165

Condensed Consolidating Statement of Earnings and Comprehensive Earnings For the Six Months Ended September 30, 2018	Parent			Guarantor Subsidiaries			Eliminations			Consolidated
Revenue	$	—		$	775,255		$	—		$	775,255
Cost of Goods Sold		—			585,690			—			585,690
Gross Profit		—			189,565			—			189,565
Equity in Earnings of Unconsolidated Joint Venture		19,424			19,424			(19,424	)		19,424
Equity in Earnings of Subsidiaries		142,288			—			(142,288	)		—
Corporate General and Administrative Expenses		(15,819	)		(2,106	)		—			(17,925	)
Legal Settlements		—			(1,800	)		—			(1,800	)
Other Non-Operating Income		(219	)		1,218			—			999
Interest Expense, net		(13,424	)		(25	)		—			(13,449	)
Earnings before Income Taxes		132,250			206,276			(161,712	)		176,814
Income Taxes		6,692			(44,564	)		—			(37,872	)
Net Earnings	$	138,942		$	161,712		$	(161,712	)	$	138,942
Net Earnings	$	138,942		$	161,712		$	(161,712	)		138,942
Net Actuarial Change in Benefit Plans, net of tax		112			112			(112	)		112
Comprehensive Earnings	$	139,054		$	161,824		$	(161,824	)	$	139,054

Condensed Consolidating Balance Sheet At September 30, 2019	Parent		Guarantor Subsidiaries			Eliminations			Consolidated
ASSETS
Current Assets -
Cash and Cash Equivalents	$	51,629	$	2,055		$	—		$	53,684
Accounts and Notes Receivable		406		182,283			—			182,689
Inventories		—		241,599			—			241,599
Prepaid and Other Current Assets		1,230		7,853			—			9,083
Total Current Assets		53,265		433,790			—			487,055
Property, Plant, and Equipment, net		7,175		1,448,884			—			1,456,059
Notes Receivable		—		6,436			—			6,436
Investment in Joint Venture		70		71,592			—			71,662
Investments in Subsidiaries and Receivables from Affiliates		2,104,394		147,051			(2,251,445	)		—
Operating Lease Right of Use Assets		10,233		53,293			—			63,526
Goodwill and Intangible Assets, net		—		230,770			—			230,770
Other Assets		4,423		6,280			—			10,703
	$	2,179,560	$	2,398,096		$	(2,251,445	)	$	2,326,211
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities-
Accounts Payable	$	6,707	$	70,949		$	—		$	77,656
Accrued Liabilities		24,194		42,179			—			66,373
Income Taxes Payable		2,931		—			—			2,931
Operating Lease Liabilities		1,145		10,170			—			11,315
Current Portion of Long-term Debt		36,500		—			—			36,500
Total Current Liabilities		71,477		123,298			—			194,775
Long-term Debt		930,426		—			—			930,426
Noncurrent Lease Liabilities		12,824		43,762			—			56,586
Other Long-term Liabilities		—		35,371			—			35,371
Payables to Affiliates		147,051		6,009,179			(6,156,230	)		—
Deferred Income Taxes		7,027		91,271			—			98,298
Total Liabilities		1,168,805		6,302,881			(6,156,230	)		1,315,456
Total Stockholders’ Equity		1,010,755		(3,904,785	)		3,904,785			1,010,755
	$	2,179,560	$	2,398,096		$	(2,251,445	)	$	2,326,211

Condensed Consolidating Balance Sheet At March 31, 2019	Parent		Guarantor Subsidiaries			Eliminations			Consolidated
ASSETS
Current Assets -
Cash and Cash Equivalents	$	5,779	$	2,822		$	—		$	8,601
Accounts and Notes Receivable		437		128,285			—			128,722
Inventories		—		275,194			—			275,194
Income Tax Receivables		5,480		—			—			5,480
Prepaid and Other Current Assets		1,472		8,152			—			9,624
Total Current Assets		13,168		414,453			—			427,621
Property, Plant, and Equipment, net		7,756		1,419,183			—			1,426,939
Notes Receivable		—		2,898			—			2,898
Investment in Joint Venture		70		64,803			—			64,873
Investments in Subsidiaries and Receivables from Affiliates		2,322,334		406,726			(2,729,060	)		—
Goodwill and Intangible Assets, net		—		229,115			—			229,115
Other Assets		4,571		13,146			—			17,717
	$	2,347,899	$	2,550,324		$	(2,729,060	)	$	2,169,163
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities-
Accounts Payable	$	5,520	$	75,364		$	—		$	80,884
Accrued Liabilities		22,470		39,479			—			61,949
Current Portion of Long-term Debt		36,500		—			—			36,500
Total Current Liabilities		64,490		114,843			—			179,333
Long-term Debt		655,092		—			—			655,092
Other Long-term Liabilities		3,303		31,189			—			34,492
Payables to Affiliates		406,726		5,730,093			(6,136,819	)		—
Deferred Income Taxes		8,801		81,958			—			90,759
Total Liabilities		1,138,412		5,958,083			(6,136,819	)		959,676
Total Stockholders’ Equity		1,209,487		(3,407,759	)		3,407,759			1,209,487
	$	2,347,899	$	2,550,324		$	(2,729,060	)	$	2,169,163

Condensed Consolidating Statement of Cash Flows For the Six Months Ended September 30, 2019	Parent			Guarantor Subsidiaries			Eliminations		Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities	$	(21,193	)	$	205,889		$	—	$	184,696
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment		—			(60,007	)		—		(60,007	)
Acquisition Spending		—			(30,872	)		—		(30,872	)
Net Cash Used in Investing Activities		—			(90,879	)		—		(90,879	)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase in Credit Facility		275,000			—			—		275,000
Dividends Paid to Stockholders		(8,815	)		—			—		(8,815	)
Purchase and Retirement of Common Stock		(313,887	)		—			—		(313,887	)
Proceeds from Stock Option Exercises		1,767			—			—		1,767
Shares Redeemed to Settle Employee Taxes on Stock Compensation		(2,799	)		—			—		(2,799	)
Intra-entity Activity, net		115,777			(115,777	)		—		—
Net Cash Provided by (Used in) Financing Activities		67,043			(115,777	)		—		(48,734	)
NET INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH		45,850			(767	)		—		45,083
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD		5,779			2,822			—		8,601
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	$	51,629		$	2,055		$	—	$	53,684

Condensed Consolidating Statement of Cash Flows For the Six Months Ended September 30, 2018	Parent			Guarantor Subsidiaries			Eliminations		Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities	$	(69,161	)	$	244,037		$	—	$	174,876
CASH FLOWS FROM INVESTING ACTIVITIES
Property, Plant, and Equipment Additions		(1,133	)		(92,311	)		—		(93,444	)
Proceeds from Sale of Property, Plant, and Equipment		—			2,281					2,281
Net Cash Used in Investing Activities		(1,133	)		(90,030	)		—		(91,163	)
CASH FLOWS FROM FINANCING ACTIVITIES
Repayment of Credit Facility		10,000			—			—		10,000
Dividends Paid to Stockholders		(9,582	)		—			—		(9,582	)
Purchase and Retirement of Common Stock		(122,404	)		—			—		(122,404	)
Proceeds from Stock Option Exercises		1,992			—			—		1,992
Shares Redeemed to Settle Employee Taxes on Stock Compensation		(1,785	)		—			—		(1,785	)
Intra-entity Activity, net		155,120			(155,120	)		—		—
Net Cash Provided by (Used in) Financing Activities		33,341			(155,120	)		—		(121,779	)
NET INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH		(36,953	)		(1,113	)		—		(38,066	)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD		44,537			3,531			—		48,068
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	$	7,584		$	2,418		$	—	$	10,002

SUPPLEMENTAL CASH FLOW INFORMATION (Tables)

6 Months Ended

Sep. 30, 2019

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

Supplemental cash flow information is as follows:

	For the Six Months Ended September 30,
	2019		2018
	(dollars in thousands)
Cash Payments:
Interest	$	18,196	$	13,855
Income Taxes		19,643		27,390
Operating Cash Flows used for Operating Leases		7,861		—

Non Cash Financing Activities:
Property and Equipment Purchases Included in Accrued Liabilities	$	2,868	$	—

INVENTORIES (Tables)

6 Months Ended

Sep. 30, 2019

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories are stated at the lower of average cost (including applicable material, labor, depreciation, and plant overhead) or net realizable value, and consist of the following:

	September 30,		March 31,
	2019		2019
	(dollars in thousands)
Raw Materials and Materials-in-Progress	$	101,904	$	125,828
Finished Cement		22,062		27,826
Aggregates		7,228		7,351
Gypsum Wallboard		5,587		7,124
Paperboard		11,364		15,660
Frac Sand		2,913		2,557
Repair Parts and Supplies		80,712		80,676
Fuel and Coal		9,829		8,172
	$	241,599	$	275,194

ACCRUED EXPENSES (Tables)

6 Months Ended

Sep. 30, 2019

Payables And Accruals [Abstract]

Schedule of Accrued Expenses

Accrued Expenses consist of the following:

	September 30,		March 31,
	2019		2019
	(dollars in thousands)
Payroll and Incentive Compensation	$	21,038	$	26,225
Benefits		14,253		12,673
Interest		3,852		3,852
Property Taxes		8,240		5,058
Power and Fuel		1,502		1,644
Litigation Settlements		—		1,900
Sales and Use Tax		2,033		2,167
Legal and Professional		6,522		—
Other		8,933		8,430
	$	66,373	$	61,949

LEASES (Tables)

6 Months Ended

Sep. 30, 2019

Leases [Abstract]

Schedule of Lease Expense for Operating and Short-Term Leases

Lease expense for our operating and short-term leases is as follows:


	For the Three Months Ended September 30, 2019		For the Six Months Ended September 30, 2019
	(dollars in thousands)
Operating Lease Cost	$	3,962	$	7,909
Short-term Lease Cost		498		1,082
Total Lease Cost	$	4,460	$	8,991

Schedule of Balance Sheet Information Related to Leases

The Right of Use Assets and Lease Liabilities are reflected on our Balance Sheet as follows:


	For the Six Months Ended September 30, 2019
	(dollars in thousands)
Operating Leases:
Operating Lease Right of Use Assets	$	63,526

Current Operating Lease Liabilities	$	11,315
Noncurrent Operating Lease Liabilities		56,586
Total Operating Lease Liabilities	$	67,901

Schedule of Future Payments for Operating Leases

Future payments for operating leases are as follows (dollars in thousands):


Fiscal Year	Amount
2020 (remaining six months)	$	7,103
2021		12,108
2022		10,618
2023		10,131
2024		8,585
Thereafter		33,579
Total Lease Payments	$	82,124
Less: Imputed Interest		(14,223	)
Present Value of Lease Liabilities	$	67,901

Weighted Average Remaining Lease Term (in years)		8.8
Weighted Average Discount Rate		3.75	%

Schedule of Future Minimum Lease Payments

As disclosed in our March 31, 2019 Form 10-K, future minimum lease payments were as follows (dollars in thousands):


Fiscal Year	Amount
2020	$	14,613
2021		11,487
2022		9,979
2023		9,784
2024		8,347
Thereafter		24,793
Total Lease Payments	$	79,003

SHARE-BASED EMPLOYEE COMPENSATION (Tables)

6 Months Ended

Sep. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Weighted-Average Assumptions Used to Value Option Awards

The weighted average assumptions used in the Black-Scholes model to value the option awards in fiscal 2020 are as follows:

	2019
Dividend Yield		1.3	%
Expected Volatility		31.4	%
Risk Free Interest Rate		2.32	%
Expected Life	6.0 years

Stock Option Activity

The following table represents stock option activity for the six months ended September 30, 2019:

	Number of Shares			Weighted Average Exercise Price
Outstanding Options at Beginning of Year		1,042,925		$	76.88
Granted		184,892		$	91.58
Exercised		(37,494	)	$	84.91
Cancelled		(7,883	)	$	106.24
Outstanding Options at End of Year		1,182,440		$	79.94
Options Exercisable at End of Year		776,586		$	73.31
Weighted Average Fair Value of Options Granted During the Year				$	27.37

Stock Options Outstanding

The following table summarizes information about stock options outstanding at September 30, 2019:

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Number of Shares Outstanding		Weighted Average Remaining Contractual Life (in years)		Weighted Average Exercise Price		Number of Shares Outstanding		Weighted Average Exercise Price
$23.17 - $29.84		65,912		1.85	$	23.27		65,912	$	23.27
$33.43 - $37.34		57,728		2.71	$	34.03		57,728	$	34.03
$53.22 - $77.67		292,595		5.77	$	71.51		228,423	$	71.35
$79.73 - $106.24		766,205		7.25	$	91.49		424,523	$	87.47
		1,182,440		6.36	$	79.94		776,586	$	73.31

Summary of Activity for Nonvested Restricted Shares

	Number of Shares			Weighted Average Grant Date Fair Value
Restricted Stock Beginning of Year		300,115		$	78.94
Granted		118,292		$	90.08
Vested		(78,307	)	$	97.88
Forfeited		(15,940	)	$	106.24
Nonvested Restricted Stock at End of Year		324,160

COMPUTATION OF EARNINGS PER SHARE (Tables)

6 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Calculation of Basic and Diluted Common Shares Outstanding

The calculation of basic and diluted common shares outstanding is as follows:

	For the Three Months Ended September 30,						For the Six Months Ended September 30,
	2019			2018			2019			2018
Weighted Average Shares of Common Stock Outstanding		41,572,127			47,219,532			42,714,896			47,453,655
Effect of Dilutive Shares:
Assumed Exercise of Outstanding Dilutive Options		649,394			785,848			700,024			807,861
Less Shares Repurchased from Proceeds of Assumed Exercised Options		(509,571	)		(588,900	)		(550,609	)		(580,350	)
Restricted Stock Units		121,825			147,338			121,404			172,306
Weighted Average Common Stock and Dilutive Securities Outstanding		41,833,775			47,563,818			42,985,715			47,853,472
Shares Excluded Due to Anti-dilution Effects		448,354			181,412			388,058			163,450

PENSION AND EMPLOYEE BENEFIT PLANS (Tables)

6 Months Ended

Sep. 30, 2019

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Cost

The following table shows the components of net periodic cost for our plans:

	For the Three Months Ended September 30,						For the Six Months Ended September 30,
	2019			2018			2019			2018
	(dollars in thousands)
Service Cost - Benefits Earned During the Period	$	85		$	100		$	170		$	200
Interest Cost of Projected Benefit Obligation		338			337			675			674
Expected Return on Plan Assets		(426	)		(463	)		(853	)		(926	)
Recognized Net Actuarial Loss		43			58			88			116
Amortization of Prior-Service Cost		—			15			—			30
Net Periodic Pension Cost	$	40		$	47		$	80		$	94

LONG-TERM DEBT (Tables)

6 Months Ended

Sep. 30, 2019

Debt Instrument [Line Items]

Long-Term Debt

Long-term Debt consists of the following:

	September 30,			March 31,
	2019			2019
	(dollars in thousands)
Bank Credit Facility	$	585,000		$	310,000
4.500% Senior Unsecured Notes Due 2026		350,000			350,000
Private Placement Senior Unsecured Notes		36,500			36,500
Total Debt		971,500			696,500
Less: Current Portion of Long-term Debt		(36,500	)		(36,500	)
Less: Debt Origination Costs		(4,574	)		(4,908	)
Long-term Debt	$	930,426		$	655,092

Schedule of Senior Unsecured Notes Redemption Prices

Beginning August 1, 2021, we may redeem some or all of the Senior Unsecured Notes at the redemption prices set forth below (expressed as a percentage of the principal amount being redeemed):

	Percentage
2021		102.25	%
2022		101.50	%
2023		100.75	%
2024 and thereafter		100.00	%

2007 Note Purchase Agreement [Member]

Debt Instrument [Line Items]

Amount Outstanding of Tranches

At September 30, 2019, the amount outstanding for the remaining tranche is as follows:

		Principal		Maturity Date		Interest Rate
Tranche D		$36.5 million		October 2, 2019			6.48	%

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

SEGMENT INFORMATION (Tables)

6 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Financial Information Related to Operations by Segment

	For the Three Months Ended September 30,						For the Six Months Ended September 30,
	2019			2018			2019			2018
	(dollars in thousands)
Revenue -
Cement	$	227,013		$	193,161		$	422,326		$	379,949
Concrete and Aggregates		55,971			39,744			95,749			80,584
Gypsum Wallboard		128,660			129,609			255,384			272,024
Paperboard		41,847			41,277			84,547			86,410
Oil and Gas Proppants		13,957			23,466			29,189			51,166
		467,448			427,257			887,195			870,133
Less: Intersegment Revenue		(23,034	)		(20,279	)		(44,679	)		(42,135	)
Less: Joint Venture Revenue		(29,888	)		(25,479	)		(57,393	)		(52,743	)
	$	414,526		$	381,499		$	785,123		$	775,255

	For the Three Months Ended September 30,				For the Six Months Ended September 30,
	2019		2018		2019		2018
	(dollars in thousands)
Intersegment Revenue -
Cement	$	6,703	$	4,073	$	10,956	$	8,251
Concrete and Aggregates		407		501		784		832
Paperboard		15,924		15,705		32,939		33,052
	$	23,034	$	20,279	$	44,679	$	42,135
Cement Sales Volume (M tons) -
Wholly Owned		1,529		1,339		2,847		2,614
Joint Venture		249		218		481		454
		1,778		1,557		3,328		3,068

	For the Three Months Ended September 30,						For the Six Months Ended September 30,
	2019			2018			2019			2018
	(dollars in thousands)
Operating Earnings -
Cement	$	66,526		$	57,547		$	102,647		$	94,881
Concrete and Aggregates		7,255			4,100			11,689			9,584
Gypsum Wallboard		38,456			45,671			76,388			96,151
Paperboard		10,095			8,609			20,039			18,603
Oil and Gas Proppants		(5,469	)		(7,823	)		(9,139	)		(10,230	)
Sub-Total		116,863			108,104			201,624			208,989
Corporate General and Administrative Expense		(13,458	)		(9,922	)		(34,712	)		(17,925	)
Litigation Settlements and Losses		—			—			—			(1,800	)
Other Non-Operating Income		942			428			1,142			999
Earnings Before Interest and Income Taxes		104,347			98,610			168,054			190,263
Interest Expense, net		(10,137	)		(6,817	)		(18,983	)		(13,449	)
Earnings Before Income Taxes	$	94,210		$	91,793		$	149,071		$	176,814
Cement Operating Earnings -
Wholly Owned	$	54,169		$	47,374		$	80,858		$	75,457
Joint Ventures		12,357			10,173			21,789			19,424
	$	66,526		$	57,547		$	102,647		$	94,881
Capital Expenditures -
Cement	$	8,209		$	14,220		$	18,746		$	33,833
Concrete and Aggregates		5,496			459			6,091			2,523
Gypsum Wallboard		6,443			4,124			8,374			6,479
Paperboard		17,239			5,345			29,599			6,410
Oil and Gas Proppants		—			14,917			65			42,866
Corporate and Other		—			1,306			—			1,333
	$	37,387		$	40,371		$	62,875		$	93,444
Depreciation, Depletion, and Amortization -
Cement	$	13,868		$	12,746		$	28,086		$	25,667
Concrete and Aggregates		2,754			2,052			4,945			4,105
Gypsum Wallboard		5,147			5,201			10,099			10,031
Paperboard		2,203			2,128			4,366			4,237
Oil and Gas Proppants		3,803			9,851			7,642			17,446
Corporate and Other		598			348			1,195			690
	$	28,373		$	32,326		$	56,333		$	62,176

	September 30,		March 31,
	2019		2019
	(dollars in thousands)
Identifiable Assets
Cement	$	1,312,488	$	1,289,468
Concrete and Aggregates		149,351		95,084
Gypsum Wallboard		368,088		372,206
Paperboard		159,457		138,614
Oil and Gas Proppants		258,739		236,357
Other, net		78,088		37,434
	$	2,326,211	$	2,169,163

Segment Breakdown of Goodwill

The segment breakdown of Goodwill is as follows:

	September 30,		March 31,
	2019		2019
	(dollars in thousands)
Cement	$	74,214	$	74,214
Gypsum Wallboard		116,618		116,618
Paperboard		7,538		7,538
Concrete and Aggregates		1,639		—
	$	200,009	$	198,370

Summarized Financial Information for Joint Venture Unconsolidated

	For the Three Months Ended September 30,				For the Six Months Ended September 30,
	2019		2018		2019		2018
	(dollars in thousands)
Revenue	$	59,775	$	51,859	$	115,617	$	107,510
Gross Margin	$	26,191	$	21,877	$	46,056	$	42,018
Earnings Before Income Taxes	$	24,713	$	20,345	$	43,577	$	38,849

	September 30,		March 31,
	2019		2019
	(dollars in thousands)
Current Assets	$	80,794	$	71,688
Non-Current Assets	$	86,523	$	81,007
Current Liabilities	$	18,863	$	19,309

INTEREST EXPENSE (Tables)

6 Months Ended

Sep. 30, 2019

Banking And Thrift Interest [Abstract]

Interest Expense, Net

The following components are included in Interest Expense, net:

	For the Three Months Ended September 30,						For the Six Months Ended September 30,
	2019			2018			2019			2018
	(dollars in thousands)
Interest Income		(7	)	$	(110	)		(11	)	$	(112	)
Interest Expense		9,861			6,660			18,432			13,002
Other Expenses		283			267			562			559
Interest Expense, net	$	10,137		$	6,817		$	18,983		$	13,449

FINANCIAL STATEMENTS FOR GUARANTORS OF THE 4.500% SENIOR UNSECURED NOTES (Tables)

6 Months Ended

Sep. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Condensed Consolidating Statement of Earnings and Comprehensive Earnings

Condensed Consolidating Statement of Earnings and Comprehensive Earnings For the Three Months Ended September 30, 2019	Parent			Guarantor Subsidiaries			Eliminations			Consolidated
Revenue	$	—		$	414,526		$	—		$	414,526
Cost of Goods Sold		—			310,020			—			310,020
Gross Profit		—			104,506			—			104,506
Equity in Earnings of Unconsolidated Joint Venture		12,357			12,357			(12,357	)		12,357
Equity in Earnings of Subsidiaries		79,981			—			(79,981	)		—
Corporate General and Administrative Expenses		(12,958	)		(500	)		—			(13,458	)
Other Non-Operating Income		(19	)		961			—			942
Interest Expense, net		(10,124	)		(13	)		—			(10,137	)
Earnings before Income Taxes		69,237			117,311			(92,338	)		94,210
Income Taxes		2,556			(24,973	)		—			(22,417	)
Net Earnings	$	71,793		$	92,338		$	(92,338	)	$	71,793
Net Earnings	$	71,793		$	92,338		$	(92,338	)	$	71,793
Net Actuarial Change in Benefit Plans, net of tax		33			33			(33	)		33
Comprehensive Earnings	$	71,826		$	92,371		$	(92,371	)	$	71,826

Condensed Consolidating Statement of Earnings and Comprehensive Earnings For the Three Months Ended September 30, 2018	Parent			Guarantor Subsidiaries			Eliminations			Consolidated
Revenue	$	—		$	381,499		$	—		$	381,499
Cost of Goods Sold		—			283,568			—			283,568
Gross Profit		—			97,931			—			97,931
Equity in Earnings of Unconsolidated Joint Venture		10,173			10,173			(10,173	)		10,173
Equity in Earnings of Subsidiaries		75,030			—			(75,030	)		—
Corporate General and Administrative Expenses		(9,090	)		(832	)		—			(9,922	)
Other Non-Operating Income		(126	)		554			—			428
Interest Expense, net		(6,806	)		(11	)		—			(6,817	)
Earnings before Income Taxes		69,181			107,815			(85,203	)		91,793
Income Taxes		3,421			(22,611	)		—			(19,190	)
Net Earnings	$	72,602		$	85,204		$	(85,203	)	$	72,603
Net Earnings	$	72,603		$	85,204		$	(85,203	)		72,603
Net Actuarial Change in Benefit Plans, net of tax		56			56			(56	)		56
Comprehensive Earnings	$	72,659		$	85,260		$	(85,259	)	$	72,659

Condensed Consolidating Statement of Earnings and Comprehensive Earnings For the Six Months Ended September 30, 2019	Parent			Guarantor Subsidiaries			Eliminations			Consolidated
Revenue	$	—		$	785,123		$	—		$	785,123
Cost of Goods Sold		—			605,288			—			605,288
Gross Profit		—			179,835			—			179,835
Equity in Earnings of Unconsolidated Joint Venture		21,789			21,789			(21,789	)		21,789
Equity in Earnings of Subsidiaries		135,723			—			(135,723	)		—
Corporate General and Administrative Expenses		(33,926	)		(786	)		—			(34,712	)
Other Non-Operating Income		407			735			—			1,142
Interest Expense, net		(18,958	)		(25	)		—			(18,983	)
Earnings before Income Taxes		105,035			201,548			(157,512	)		149,071
Income Taxes		8,062			(44,036	)		—			(35,974	)
Net Earnings	$	113,097		$	157,512		$	(157,512	)	$	113,097
Net Earnings	$	113,097		$	157,512		$	(157,512	)	$	113,097
Net Actuarial Change in Benefit Plans, net of tax		68			68			(68	)		68
Comprehensive Earnings	$	113,165		$	157,580		$	(157,580	)	$	113,165

Condensed Consolidating Statement of Earnings and Comprehensive Earnings For the Six Months Ended September 30, 2018	Parent			Guarantor Subsidiaries			Eliminations			Consolidated
Revenue	$	—		$	775,255		$	—		$	775,255
Cost of Goods Sold		—			585,690			—			585,690
Gross Profit		—			189,565			—			189,565
Equity in Earnings of Unconsolidated Joint Venture		19,424			19,424			(19,424	)		19,424
Equity in Earnings of Subsidiaries		142,288			—			(142,288	)		—
Corporate General and Administrative Expenses		(15,819	)		(2,106	)		—			(17,925	)
Legal Settlements		—			(1,800	)		—			(1,800	)
Other Non-Operating Income		(219	)		1,218			—			999
Interest Expense, net		(13,424	)		(25	)		—			(13,449	)
Earnings before Income Taxes		132,250			206,276			(161,712	)		176,814
Income Taxes		6,692			(44,564	)		—			(37,872	)
Net Earnings	$	138,942		$	161,712		$	(161,712	)	$	138,942
Net Earnings	$	138,942		$	161,712		$	(161,712	)		138,942
Net Actuarial Change in Benefit Plans, net of tax		112			112			(112	)		112
Comprehensive Earnings	$	139,054		$	161,824		$	(161,824	)	$	139,054

Condensed Consolidating Balance Sheet

Condensed Consolidating Balance Sheet At September 30, 2019	Parent		Guarantor Subsidiaries			Eliminations			Consolidated
ASSETS
Current Assets -
Cash and Cash Equivalents	$	51,629	$	2,055		$	—		$	53,684
Accounts and Notes Receivable		406		182,283			—			182,689
Inventories		—		241,599			—			241,599
Prepaid and Other Current Assets		1,230		7,853			—			9,083
Total Current Assets		53,265		433,790			—			487,055
Property, Plant, and Equipment, net		7,175		1,448,884			—			1,456,059
Notes Receivable		—		6,436			—			6,436
Investment in Joint Venture		70		71,592			—			71,662
Investments in Subsidiaries and Receivables from Affiliates		2,104,394		147,051			(2,251,445	)		—
Operating Lease Right of Use Assets		10,233		53,293			—			63,526
Goodwill and Intangible Assets, net		—		230,770			—			230,770
Other Assets		4,423		6,280			—			10,703
	$	2,179,560	$	2,398,096		$	(2,251,445	)	$	2,326,211
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities-
Accounts Payable	$	6,707	$	70,949		$	—		$	77,656
Accrued Liabilities		24,194		42,179			—			66,373
Income Taxes Payable		2,931		—			—			2,931
Operating Lease Liabilities		1,145		10,170			—			11,315
Current Portion of Long-term Debt		36,500		—			—			36,500
Total Current Liabilities		71,477		123,298			—			194,775
Long-term Debt		930,426		—			—			930,426
Noncurrent Lease Liabilities		12,824		43,762			—			56,586
Other Long-term Liabilities		—		35,371			—			35,371
Payables to Affiliates		147,051		6,009,179			(6,156,230	)		—
Deferred Income Taxes		7,027		91,271			—			98,298
Total Liabilities		1,168,805		6,302,881			(6,156,230	)		1,315,456
Total Stockholders’ Equity		1,010,755		(3,904,785	)		3,904,785			1,010,755
	$	2,179,560	$	2,398,096		$	(2,251,445	)	$	2,326,211

Condensed Consolidating Balance Sheet At March 31, 2019	Parent		Guarantor Subsidiaries			Eliminations			Consolidated
ASSETS
Current Assets -
Cash and Cash Equivalents	$	5,779	$	2,822		$	—		$	8,601
Accounts and Notes Receivable		437		128,285			—			128,722
Inventories		—		275,194			—			275,194
Income Tax Receivables		5,480		—			—			5,480
Prepaid and Other Current Assets		1,472		8,152			—			9,624
Total Current Assets		13,168		414,453			—			427,621
Property, Plant, and Equipment, net		7,756		1,419,183			—			1,426,939
Notes Receivable		—		2,898			—			2,898
Investment in Joint Venture		70		64,803			—			64,873
Investments in Subsidiaries and Receivables from Affiliates		2,322,334		406,726			(2,729,060	)		—
Goodwill and Intangible Assets, net		—		229,115			—			229,115
Other Assets		4,571		13,146			—			17,717
	$	2,347,899	$	2,550,324		$	(2,729,060	)	$	2,169,163
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities-
Accounts Payable	$	5,520	$	75,364		$	—		$	80,884
Accrued Liabilities		22,470		39,479			—			61,949
Current Portion of Long-term Debt		36,500		—			—			36,500
Total Current Liabilities		64,490		114,843			—			179,333
Long-term Debt		655,092		—			—			655,092
Other Long-term Liabilities		3,303		31,189			—			34,492
Payables to Affiliates		406,726		5,730,093			(6,136,819	)		—
Deferred Income Taxes		8,801		81,958			—			90,759
Total Liabilities		1,138,412		5,958,083			(6,136,819	)		959,676
Total Stockholders’ Equity		1,209,487		(3,407,759	)		3,407,759			1,209,487
	$	2,347,899	$	2,550,324		$	(2,729,060	)	$	2,169,163

Condensed Consolidating Statement of Cash Flows

Condensed Consolidating Statement of Cash Flows For the Six Months Ended September 30, 2019	Parent			Guarantor Subsidiaries			Eliminations		Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities	$	(21,193	)	$	205,889		$	—	$	184,696
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment		—			(60,007	)		—		(60,007	)
Acquisition Spending		—			(30,872	)		—		(30,872	)
Net Cash Used in Investing Activities		—			(90,879	)		—		(90,879	)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase in Credit Facility		275,000			—			—		275,000
Dividends Paid to Stockholders		(8,815	)		—			—		(8,815	)
Purchase and Retirement of Common Stock		(313,887	)		—			—		(313,887	)
Proceeds from Stock Option Exercises		1,767			—			—		1,767
Shares Redeemed to Settle Employee Taxes on Stock Compensation		(2,799	)		—			—		(2,799	)
Intra-entity Activity, net		115,777			(115,777	)		—		—
Net Cash Provided by (Used in) Financing Activities		67,043			(115,777	)		—		(48,734	)
NET INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH		45,850			(767	)		—		45,083
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD		5,779			2,822			—		8,601
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	$	51,629		$	2,055		$	—	$	53,684

Condensed Consolidating Statement of Cash Flows For the Six Months Ended September 30, 2018	Parent			Guarantor Subsidiaries			Eliminations		Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities	$	(69,161	)	$	244,037		$	—	$	174,876
CASH FLOWS FROM INVESTING ACTIVITIES
Property, Plant, and Equipment Additions		(1,133	)		(92,311	)		—		(93,444	)
Proceeds from Sale of Property, Plant, and Equipment		—			2,281					2,281
Net Cash Used in Investing Activities		(1,133	)		(90,030	)		—		(91,163	)
CASH FLOWS FROM FINANCING ACTIVITIES
Repayment of Credit Facility		10,000			—			—		10,000
Dividends Paid to Stockholders		(9,582	)		—			—		(9,582	)
Purchase and Retirement of Common Stock		(122,404	)		—			—		(122,404	)
Proceeds from Stock Option Exercises		1,992			—			—		1,992
Shares Redeemed to Settle Employee Taxes on Stock Compensation		(1,785	)		—			—		(1,785	)
Intra-entity Activity, net		155,120			(155,120	)		—		—
Net Cash Provided by (Used in) Financing Activities		33,341			(155,120	)		—		(121,779	)
NET INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH		(36,953	)		(1,113	)		—		(38,066	)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD		44,537			3,531			—		48,068
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	$	7,584		$	2,418		$	—	$	10,002

Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Payments:
Interest	$ 18,196	$ 13,855
Income Taxes	19,643	$ 27,390
Operating Cash Flows used for Operating Leases	7,861
Non Cash Financing Activities:
Property and Equipment Purchases Included in Accrued Liabilities	$ 2,868

Accounts and Notes Receivable - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2019	Mar. 31, 2019
Receivables [Abstract]
Allowance for doubtful accounts	$ 12.3	$ 9.9
Notes Receivable, total	7.5
Notes Receivable, current	$ 1.1
Notes Receivable interest rate	4.75%
Notes Receivable, maturity description	Remaining unpaid amounts, plus accrued interest, mature in fiscal 2025.

Schedule of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Inventory [Line Items]
Inventories	$ 241,599	$ 275,194
Raw Materials and Material-in-Progress [Member]
Inventory [Line Items]
Inventories	101,904	125,828
Finished Cement [Member]
Inventory [Line Items]
Inventories	22,062	27,826
Aggregates [Member]
Inventory [Line Items]
Inventories	7,228	7,351
Gypsum Wallboard [Member]
Inventory [Line Items]
Inventories	5,587	7,124
Paperboard [Member]
Inventory [Line Items]
Inventories	11,364	15,660
Frac Sand [Member]
Inventory [Line Items]
Inventories	2,913	2,557
Repair Parts and Supplies [Member]
Inventory [Line Items]
Inventories	80,712	80,676
Fuel and Coal [Member]
Inventory [Line Items]
Inventories	$ 9,829	$ 8,172

Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Accounts Payable And Accrued Liabilities Current [Abstract]
Payroll and Incentive Compensation	$ 21,038	$ 26,225
Benefits	14,253	12,673
Interest	3,852	3,852
Property Taxes	8,240	5,058
Power and Fuel	1,502	1,644
Litigation Settlements		1,900
Sales and Use Tax	2,033	2,167
Legal and Professional	6,522
Other	8,933	8,430
Accrued Expenses, Total	$ 66,373	$ 61,949

Schedule of Future Payments for Operating Leases (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Leases [Abstract]
2020 (remaining six months)	$ 7,103
2021	12,108
2022	10,618
2023	10,131
2024	8,585
Thereafter	33,579
Total Lease Payments	82,124
Less: Imputed Interest	(14,223)
Present Value of Lease Liabilities	$ 67,901
Weighted Average Remaining Lease Term (in years)	8 years 9 months 18 days
Weighted Average Discount Rate	3.75%

Schedule of Future Minimum Lease Payments (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Leases [Abstract]
2020	$ 14,613
2021	11,487
2022	9,979
2023	9,784
2024	8,347
Thereafter	24,793
Total Lease Payments	$ 79,003

Share-Based Employee Compensation - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Aug. 31, 2019	Aug. 07, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant		3,756,577		3,756,577			3,000,000
Stock option expense		$ 1.2	$ 1.0	$ 2.3	$ 2.0
Aggregate intrinsic value for outstanding options		15.4		15.4
Total intrinsic value of options exercised				1.4
Restricted stock or unit expense		2.7	$ 3.1	$ 9.8	$ 5.5
Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant							1,500,000
Performance Vesting Stock Options [Member] \| Long Term Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant	100,849
Reduced percentage of shares earned in stock options plan				66.70%
Stock based compensation plan, description				The performance criteria for the Fiscal 2020 Employee Performance Stock Option Grant is based upon the achievement of certain levels of return on equity (as defined in the option agreements), ranging from 10.0% to 20.0%, for the fiscal year ending March 31, 2020. All stock options will be earned if the return on equity is 20.0% or greater, and the percentage of shares earned will be reduced proportionately to approximately 66.7% if the return on equity is 10.0%. If the Company does not achieve a return on equity of at least 10.0%, all stock options granted will be forfeited.
Share-based compensation vesting period	4 years
Share-based compensation award expiration term	10 years
Performance Vesting Stock Options [Member] \| Long Term Compensation Plan [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of average return on invested capital	10.00%
Share-based compensation expiration date				Mar. 31, 2020
Performance Vesting Stock Options [Member] \| Long Term Compensation Plan [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of average return on invested capital	20.00%
Share-based compensation expiration date				Mar. 31, 2023
Time Vesting Stock Options [Member] \| Long Term Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant	84,043
Share-based compensation vesting period	4 years
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost, stock options		9.6		$ 9.6
Weighted-average period of recognition of unrecognized compensation cost				2 years 8 months 12 days
Performance Vesting Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant	51,112
Stock based compensation plan, description				The performance criteria for the Fiscal 2020 Employee Restricted Stock Performance Award is based upon the achievement of certain levels of return on equity (as defined in the award agreement), ranging from 10.0% to 20.0%, for the fiscal year ending March 31, 2020. All restricted shares will be earned if the return on equity is 20.0% or greater, and the percentage of shares earned will be reduced proportionately to approximately 66.7% if the return on equity is 10.0%. If the Company does not achieve a return on equity of at least 10.0%, all awards will be forfeited.
Share-based compensation vesting period	4 years
Reduced percentage of restricted shares				66.70%
Performance Vesting Restricted Stock [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of average return on invested capital	10.00%
Share-based compensation vesting date				Mar. 31, 2020
Performance Vesting Restricted Stock [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of average return on invested capital	20.00%
Share-based compensation vesting date				Mar. 31, 2022
Time Vesting Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant	42,591
Share-based compensation vesting period	4 years
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant						24,589
Weighted-average period of recognition of unrecognized compensation cost				2 years 2 months 12 days
Unrecognized compensation cost		$ 18.4		$ 18.4

Weighted-Average Assumptions Used to Value Option Awards (Detail) - Long Term Compensation Plan [Member] - Stock Options [Member]	6 Months Ended
	Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend Yield	1.30%
Expected Volatility	31.40%
Risk Free Interest Rate	2.32%
Expected Life	6 years

Stock Option Activity (Detail)	6 Months Ended
Stock Option Activity (Detail)	Sep. 30, 2019 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding Options at Beginning of Year \| shares	1,042,925
Number of Shares, Granted \| shares	184,892
Number of Shares, Exercised \| shares	(37,494)
Number of Shares, Cancelled \| shares	(7,883)
Number of Shares, Outstanding Options at End of Year \| shares	1,182,440
Number of Shares, Options Exercisable at End of Year \| shares	776,586
Weighted-Average Exercise Price, Outstanding Options at Beginning of Year	$ 76.88
Weighted-Average Exercise Price, Granted	91.58
Weighted-Average Exercise Price, Exercised	84.91
Weighted-Average Exercise Price, Cancelled	106.24
Weighted-Average Exercise Price, Outstanding Options at End of Year	79.94
Weighted-Average Exercise Price, Options Exercisable at End of Period	73.31
Weighted Average Fair Value of Options Granted During the Year	$ 27.37

Stock Options Outstanding (Detail)	6 Months Ended
Stock Options Outstanding (Detail)	Sep. 30, 2019 $ / shares shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding, Number of Shares Outstanding \| shares	1,182,440
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	6 years 4 months 9 days
Options Outstanding, Weighted-Average Exercise Price	$ 79.94
Options Exercisable , Number of Shares Outstanding \| shares	776,586
Options Exercisable, Weighted-Average Exercise Price	$ 73.31
$23.17 - $29.84 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	23.17
Range of Exercise Prices, Upper Range	$ 29.84
Options Outstanding, Number of Shares Outstanding \| shares	65,912
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	1 year 10 months 6 days
Options Outstanding, Weighted-Average Exercise Price	$ 23.27
Options Exercisable , Number of Shares Outstanding \| shares	65,912
Options Exercisable, Weighted-Average Exercise Price	$ 23.27
$33.43 - $ 37.34 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	33.43
Range of Exercise Prices, Upper Range	$ 37.34
Options Outstanding, Number of Shares Outstanding \| shares	57,728
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	2 years 8 months 16 days
Options Outstanding, Weighted-Average Exercise Price	$ 34.03
Options Exercisable , Number of Shares Outstanding \| shares	57,728
Options Exercisable, Weighted-Average Exercise Price	$ 34.03
$53.22 - $ 77.67 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	53.22
Range of Exercise Prices, Upper Range	$ 77.67
Options Outstanding, Number of Shares Outstanding \| shares	292,595
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	5 years 9 months 7 days
Options Outstanding, Weighted-Average Exercise Price	$ 71.51
Options Exercisable , Number of Shares Outstanding \| shares	228,423
Options Exercisable, Weighted-Average Exercise Price	$ 71.35
$79.73 - $ 106.24 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	79.73
Range of Exercise Prices, Upper Range	$ 106.24
Options Outstanding, Number of Shares Outstanding \| shares	766,205
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	7 years 3 months
Options Outstanding, Weighted-Average Exercise Price	$ 91.49
Options Exercisable , Number of Shares Outstanding \| shares	424,523
Options Exercisable, Weighted-Average Exercise Price	$ 87.47

Summary of Activity for Nonvested Restricted Shares (Detail) - Restricted Stock [Member]	6 Months Ended
	Sep. 30, 2019 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Nonvested at Beginning of Year	300,115
Number of Shares, Granted	118,292
Number of Shares, Vested	(78,307)
Number of Shares, Forfeited	(15,940)
Number of Shares, Nonvested at End of Year	324,160
Weighted Average Grant Date Fair Value, Beginning of Year \| $ / shares	$ 78.94
Weighted Average Grant Date Fair Value, Granted \| $ / shares	90.08
Weighted Average Grant Date Fair Value, Vested \| $ / shares	97.88
Weighted Average Grant Date Fair Value, Forfeited \| $ / shares	$ 106.24

Calculation of Basic and Diluted Common Shares Outstanding (Detail) - shares	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Weighted Average Shares of Common Stock Outstanding	41,572,127	47,219,532	42,714,896	47,453,655
Assumed Exercise of Outstanding Dilutive Options	649,394	785,848	700,024	807,861
Less Shares Repurchased from Proceeds of Assumed Exercised Options	(509,571)	(588,900)	(550,609)	(580,350)
Restricted Stock Units	121,825	147,338	121,404	172,306
Weighted Average Common Stock and Dilutive Securities Outstanding	41,833,775	47,563,818	42,985,715	47,853,472
Shares Excluded Due to Anti-dilution Effects	448,354	181,412	388,058	163,450

Components of Net Periodic Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Compensation And Retirement Disclosure [Abstract]
Service Cost - Benefits Earned During the Period	$ 85	$ 100	$ 170	$ 200
Interest Cost of Projected Benefit Obligation	338	337	675	674
Expected Return on Plan Assets	(426)	(463)	(853)	(926)
Recognized Net Actuarial Loss	43	58	88	116
Amortization of Prior-Service Cost		15		30
Net Periodic Pension Cost	$ 40	$ 47	$ 80	$ 94

Long-Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019	Aug. 02, 2016
Debt Instrument [Line Items]
Bank Credit Facility	$ 585,000	$ 310,000
Total Debt	971,500	696,500
Less: Current Portion of Long-term Debt	(36,500)	(36,500)
Less: Debt Origination Costs	(4,574)	(4,908)
Long-term Debt	930,426	655,092
4.500% Senior Unsecured Notes Due 2026 [Member]
Debt Instrument [Line Items]
Total Debt	350,000	350,000	$ 350,000
Private Placement Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Total Debt	$ 36,500	$ 36,500

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Long-Term Debt - Additional Information (Detail)			6 Months Ended
Long-Term Debt - Additional Information (Detail)	Aug. 02, 2016 USD ($)	Oct. 31, 2014	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Oct. 02, 2007 USD ($) Loan
Debt Instrument [Line Items]
Bank Credit Facility, borrowings available			$ 158,100,000
Interest coverage ratio		250.00%
Borrowings outstanding under Credit Facility			585,000,000	$ 310,000,000
Letter of Credit Facility			40,000,000.0
Outstanding letters of credit , amount			6,900,000
Debt instrument, principal amount			971,500,000	696,500,000
Minimum [Member]
Debt Instrument [Line Items]
Unused line of credit commitment fee based on leverage ratio		0.10%
Maximum [Member]
Debt Instrument [Line Items]
Consolidated funded indebtedness ratio		350.00%
Unused line of credit commitment fee based on leverage ratio		0.35%
London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Variable margin		1.00%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Variable margin		2.25%
Federal Funds Effective Swap Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Variable margin		0.00%
Federal Funds Effective Swap Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Variable margin		1.25%
4.500% Senior Unsecured Notes Due 2026 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 350,000,000.0		$ 350,000,000	$ 350,000,000
Debt instrument, interest rate	4.50%		4.50%
Debt instrument, maturity period	2026-08
4.500% Senior Unsecured Notes Due 2026 [Member] \| Prior to August 1, 2021 [Member]
Debt Instrument [Line Items]
Redemption price, percentage	100.00%
2007 Note Purchase Agreement [Member]
Debt Instrument [Line Items]
Number of tranches \| Loan					4
Senior Notes, sale					$ 200,000,000.0
Senior Notes, payment terms			Interest for the Series 2007A Senior Unsecured Notes is payable semi-annually April 2 and October 2 of each year until all principal is paid for the respective tranche.
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility, principal balance			$ 500,000,000.0
Bank Credit Facility, borrowings available			$ 750,000,000.0
Credit Facility, termination date			Aug. 02, 2021
Credit Facility, interest rate description			At our option, outstanding principal amounts on the Credit Facility bear interest at a variable rate equal to either (i) the London Interbank Offered Rate (LIBOR) plus an agreed margin (ranging from 100 to 225 basis points), which is to be established quarterly based on the Company’s ratio of consolidated EBITDA, defined as earnings before interest, taxes, depreciation, and amortization, to the Company’s consolidated indebtedness (the Leverage Ratio); or (ii) an alternative base rate which is the higher of (a) the prime rate or (b) the federal funds rate plus 1⁄2% per annum plus an applicable rate (ranging from 0 to 125 basis points). In the case of loans bearing interest at a rate based on the federal funds rate, interest payments are payable quarterly. In the case of loans bearing interest at a rate based on LIBOR, interest is payable at the end of the LIBOR advance periods, which can be up to nine months at the option of the Company. The Company is also required to pay a commitment fee on unused available borrowings under the Credit Facility ranging from 10 to 35 basis points depending upon the Leverage Ratio.
Revolving Credit Facility [Member] \| Swingline Loan [Member]
Debt Instrument [Line Items]
Credit Facility, principal balance			$ 25,000,000.0
Line of Credit \| Federal Funds Effective Swap Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Variable margin		0.50%
Letter of Credit [Member]
Debt Instrument [Line Items]
Bank Credit Facility, one-time fee			0.125%

Amount Outstanding of Tranches - Two Thousand Seven Note Purchase Agreement (Detail) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2019	Mar. 31, 2019
Debt Instrument [Line Items]
Principal	$ 971,500	$ 696,500
2007 Note Purchase Agreement [Member] \| Series 2007A Tranche D [Member]
Debt Instrument [Line Items]
Principal	$ 36,500
Maturity Date	Oct. 02, 2019
Interest Rate	6.48%

Segment Information - Additional Information (Detail) $ in Millions	6 Months Ended
	Sep. 30, 2019 USD ($) Location Facility Terminal Plant Sector Segment
Segment Reporting [Abstract]
Number of sectors \| Sector	3
Number of reportable business segments \| Segment	5
Cement plant locations \| Location	7
Slag grinding facility \| Facility	1
Cement distribution terminals \| Terminal	19
Gypsum wallboard plants \| Plant	5
Readymix concrete batch plants \| Plant	25
Aggregates processing plants \| Plant	5
Number of frac sand processing facilities \| Facility	2
Number of frac sand drying facilities \| Facility	4
Number of frac sand trans-load locations \| Location	5
Proportionate consolidation of share of Joint Venture's revenues and operating earnings	50.00%
Accrued capital expenditures \| $	$ 2.9

Financial Information Related to Operations by Segment (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019 USD ($) kT	Sep. 30, 2018 USD ($) kT	Sep. 30, 2019 USD ($) kT	Sep. 30, 2018 USD ($) kT	Mar. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Revenue	$ 414,526	$ 381,499	$ 785,123	$ 775,255
Less: Joint Venture Revenue	(29,888)	(25,479)	(57,393)	(52,743)
Operating Earnings	116,863	108,104	201,624	208,989
Corporate General and Administrative Expense	(13,458)	(9,922)	(34,712)	(17,925)
Litigation Settlements and Losses				(1,800)
Other Non-Operating Income	942	428	1,142	999
Earnings Before Interest and Income Taxes	104,347	98,610	168,054	190,263
Interest Expense, Net	(10,137)	(6,817)	(18,983)	(13,449)
Earnings before Income Taxes	94,210	91,793	149,071	176,814
Capital Expenditures	37,387	40,371	62,875	93,444
Depreciation, Depletion, and Amortization	28,373	32,326	56,333	62,176
Identifiable Assets	2,326,211		2,326,211		$ 2,169,163
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	467,448	427,257	887,195	870,133
Operating Earnings	66,526	57,547	102,647	94,881
Operating Segments [Member] \| Wholly-Owned [Member]
Segment Reporting Information [Line Items]
Operating Earnings	54,169	47,374	80,858	75,457
Operating Segments [Member] \| Joint Venture [Member]
Segment Reporting Information [Line Items]
Operating Earnings	12,357	10,173	21,789	19,424
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(23,034)	(20,279)	(44,679)	(42,135)
Other [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	78,088		78,088		37,434
Cement [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	$ 227,013	$ 193,161	$ 422,326	$ 379,949
Cement Sales Volume \| kT	1,778	1,557	3,328	3,068
Operating Earnings	$ 66,526	$ 57,547	$ 102,647	$ 94,881
Capital Expenditures	8,209	14,220	18,746	33,833
Depreciation, Depletion, and Amortization	13,868	$ 12,746	28,086	$ 25,667
Identifiable Assets	$ 1,312,488		$ 1,312,488		1,289,468
Cement [Member] \| Operating Segments [Member] \| Wholly-Owned [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume \| kT	1,529	1,339	2,847	2,614
Cement [Member] \| Operating Segments [Member] \| Joint Venture [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume \| kT	249	218	481	454
Cement [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	$ (6,703)	$ (4,073)	$ (10,956)	$ (8,251)
Concrete and Aggregates [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	55,971	39,744	95,749	80,584
Operating Earnings	7,255	4,100	11,689	9,584
Capital Expenditures	5,496	459	6,091	2,523
Depreciation, Depletion, and Amortization	2,754	2,052	4,945	4,105
Identifiable Assets	149,351		149,351		95,084
Concrete and Aggregates [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(407)	(501)	(784)	(832)
Gypsum Wallboard [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	128,660	129,609	255,384	272,024
Operating Earnings	38,456	45,671	76,388	96,151
Capital Expenditures	6,443	4,124	8,374	6,479
Depreciation, Depletion, and Amortization	5,147	5,201	10,099	10,031
Identifiable Assets	368,088		368,088		372,206
Paperboard [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	41,847	41,277	84,547	86,410
Operating Earnings	10,095	8,609	20,039	18,603
Capital Expenditures	17,239	5,345	29,599	6,410
Depreciation, Depletion, and Amortization	2,203	2,128	4,366	4,237
Identifiable Assets	159,457		159,457		138,614
Paperboard [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(15,924)	(15,705)	(32,939)	(33,052)
Oil and Gas Proppants [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	13,957	23,466	29,189	51,166
Operating Earnings	(5,469)	(7,823)	(9,139)	(10,230)
Capital Expenditures		14,917	65	42,866
Depreciation, Depletion, and Amortization	3,803	9,851	7,642	17,446
Identifiable Assets	258,739		258,739		$ 236,357
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Capital Expenditures		1,306		1,333
Depreciation, Depletion, and Amortization	$ 598	$ 348	$ 1,195	$ 690

Summarized Financial Information for Joint Venture Unconsolidated (Detail) - Joint Venture [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Related Party Transaction [Line Items]
Revenue	$ 59,775	$ 51,859	$ 115,617	$ 107,510
Gross Margin	26,191	21,877	46,056	42,018
Earnings Before Income Taxes	24,713	$ 20,345	43,577	$ 38,849
Current Assets	80,794		80,794		$ 71,688
Non-Current Assets	86,523		86,523		81,007
Current Liabilities	$ 18,863		$ 18,863		$ 19,309

Interest Expense, Net (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Interest Expense, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest Income (Expense), Net [Abstract]
Interest Income	$ (7)	$ (110)	$ (11)	$ (112)
Interest Expense	9,861	6,660	18,432	13,002
Other Expenses	283	267	562	559
Interest Expense, net	$ 10,137	$ 6,817	$ 18,983	$ 13,449

Condensed Consolidating Statement of Earnings and Comprehensive Earnings (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue	$ 414,526		$ 381,499		$ 785,123	$ 775,255
Cost of Goods Sold	310,020		283,568		605,288	585,690
Gross Profit	104,506		97,931		179,835	189,565
Equity in Earnings of Unconsolidated Joint Venture	12,357		10,173		21,789	19,424
Corporate General and Administrative Expense	(13,458)		(9,922)		(34,712)	(17,925)
Legal Settlements						(1,800)
Other Non-Operating Income	942		428		1,142	999
Interest Expense, net	(10,137)		(6,817)		(18,983)	(13,449)
Earnings before Income Taxes	94,210		91,793		149,071	176,814
Income Taxes	(22,417)		(19,190)		(35,974)	(37,872)
Net Earnings	71,793	$ 41,304	72,603	$ 66,339	113,097	138,942
Net Actuarial Change in Benefit Plans, net of tax	33		56		68	112
Comprehensive Earnings	71,826		72,659		113,165	139,054
Eliminations [Member]
Equity in Earnings of Unconsolidated Joint Venture	(12,357)		(10,173)		(21,789)	(19,424)
Equity in Earnings of Subsidiaries	(79,981)		(75,030)		(135,723)	(142,288)
Earnings before Income Taxes	(92,338)		(85,203)		(157,512)	(161,712)
Net Earnings	(92,338)		(85,203)		(157,512)	(161,712)
Net Actuarial Change in Benefit Plans, net of tax	(33)		(56)		(68)	(112)
Comprehensive Earnings	(92,371)		(85,259)		(157,580)	(161,824)
Parent [Member] \| Reportable Legal Entities [Member]
Equity in Earnings of Unconsolidated Joint Venture	12,357		10,173		21,789	19,424
Equity in Earnings of Subsidiaries	79,981		75,030		135,723	142,288
Corporate General and Administrative Expense	(12,958)		(9,090)		(33,926)	(15,819)
Other Non-Operating Income	(19)		(126)		407	(219)
Interest Expense, net	(10,124)		(6,806)		(18,958)	(13,424)
Earnings before Income Taxes	69,237		69,181		105,035	132,250
Income Taxes	2,556		3,421		8,062	6,692
Net Earnings	71,793		72,603		113,097	138,942
Net Actuarial Change in Benefit Plans, net of tax	33		56		68	112
Comprehensive Earnings	71,826		72,659		113,165	139,054
Guarantor Subsidiaries [Member] \| Reportable Legal Entities [Member]
Revenue	414,526		381,499		785,123	775,255
Cost of Goods Sold	310,020		283,568		605,288	585,690
Gross Profit	104,506		97,931		179,835	189,565
Equity in Earnings of Unconsolidated Joint Venture	12,357		10,173		21,789	19,424
Corporate General and Administrative Expense	(500)		(832)		(786)	(2,106)
Legal Settlements						(1,800)
Other Non-Operating Income	961		554		735	1,218
Interest Expense, net	(13)		(11)		(25)	(25)
Earnings before Income Taxes	117,311		107,815		201,548	206,276
Income Taxes	(24,973)		(22,611)		(44,036)	(44,564)
Net Earnings	92,338		85,204		157,512	161,712
Net Actuarial Change in Benefit Plans, net of tax	33		56		68	112
Comprehensive Earnings	$ 92,371		$ 85,260		$ 157,580	$ 161,824

Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Current Assets -
Cash and Cash Equivalents	$ 53,684		$ 8,601
Accounts and Notes Receivable	182,689		128,722
Inventories	241,599		275,194
Prepaid and Other Current Assets	9,083		9,624
Income Tax Receivable			5,480
Total Current Assets	487,055		427,621
Property, Plant, and Equipment, net	1,456,059		1,426,939
Notes Receivable	6,436		2,898
Investment in Joint Venture	71,662		64,873
Operating Lease Right of Use Assets	63,526
Goodwill and Intangible Assets, net	230,770		229,115
Other Assets	10,703		17,717
Total Assets	2,326,211		2,169,163
Current Liabilities -
Accounts Payable	77,656		80,884
Accrued Liabilities	66,373		61,949
Income Taxes Payable	2,931
Operating Lease Liabilities	11,315
Current Portion of Long-term Debt	36,500		36,500
Total Current Liabilities	194,775		179,333
Long-term Debt	930,426		655,092
Noncurrent Lease Liabilities	56,586
Other Long-term Liabilities	35,371		34,492
Deferred Income Taxes	98,298		90,759
Total Liabilities	1,315,456		959,676
Total Stockholders’ Equity	1,010,755	$ 1,055,266	1,209,487	$ 1,432,603	$ 1,431,479	$ 1,417,690
Liabilities and Stockholders' Equity, Total	2,326,211		2,169,163
Eliminations [Member]
Current Assets -
Investments in Subsidiaries and Receivables from Affiliates	(2,251,445)		(2,729,060)
Total Assets	(2,251,445)		(2,729,060)
Current Liabilities -
Payables to Affiliates	(6,156,230)		(6,136,819)
Total Liabilities	(6,156,230)		(6,136,819)
Total Stockholders’ Equity	3,904,785		3,407,759
Liabilities and Stockholders' Equity, Total	(2,251,445)		(2,729,060)
Parent [Member] \| Reportable Legal Entities [Member]
Current Assets -
Cash and Cash Equivalents	51,629		5,779
Accounts and Notes Receivable	406		437
Prepaid and Other Current Assets	1,230		1,472
Income Tax Receivable			5,480
Total Current Assets	53,265		13,168
Property, Plant, and Equipment, net	7,175		7,756
Investment in Joint Venture	70		70
Investments in Subsidiaries and Receivables from Affiliates	2,104,394		2,322,334
Operating Lease Right of Use Assets	10,233
Other Assets	4,423		4,571
Total Assets	2,179,560		2,347,899
Current Liabilities -
Accounts Payable	6,707		5,520
Accrued Liabilities	24,194		22,470
Income Taxes Payable	2,931
Operating Lease Liabilities	1,145
Current Portion of Long-term Debt	36,500		36,500
Total Current Liabilities	71,477		64,490
Long-term Debt	930,426		655,092
Noncurrent Lease Liabilities	12,824
Other Long-term Liabilities			3,303
Payables to Affiliates	147,051		406,726
Deferred Income Taxes	7,027		8,801
Total Liabilities	1,168,805		1,138,412
Total Stockholders’ Equity	1,010,755		1,209,487
Liabilities and Stockholders' Equity, Total	2,179,560		2,347,899
Guarantor Subsidiaries [Member] \| Reportable Legal Entities [Member]
Current Assets -
Cash and Cash Equivalents	2,055		2,822
Accounts and Notes Receivable	182,283		128,285
Inventories	241,599		275,194
Prepaid and Other Current Assets	7,853		8,152
Total Current Assets	433,790		414,453
Property, Plant, and Equipment, net	1,448,884		1,419,183
Notes Receivable	6,436		2,898
Investment in Joint Venture	71,592		64,803
Investments in Subsidiaries and Receivables from Affiliates	147,051		406,726
Operating Lease Right of Use Assets	53,293
Goodwill and Intangible Assets, net	230,770		229,115
Other Assets	6,280		13,146
Total Assets	2,398,096		2,550,324
Current Liabilities -
Accounts Payable	70,949		75,364
Accrued Liabilities	42,179		39,479
Operating Lease Liabilities	10,170
Total Current Liabilities	123,298		114,843
Noncurrent Lease Liabilities	43,762
Other Long-term Liabilities	35,371		31,189
Payables to Affiliates	6,009,179		5,730,093
Deferred Income Taxes	91,271		81,958
Total Liabilities	6,302,881		5,958,083
Total Stockholders’ Equity	(3,904,785)		(3,407,759)
Liabilities and Stockholders' Equity, Total	$ 2,398,096		$ 2,550,324

Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands		6 Months Ended
	Aug. 02, 2019	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities		$ 184,696	$ 174,876
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment		(60,007)	(93,444)
Proceeds from Sale of Property, Plant, and Equipment			2,281
Acquisition Spending	$ (30,900)	(30,872)
Net Cash Used in Investing Activities		(90,879)	(91,163)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (Repayment) of Credit Facility		275,000	10,000
Dividends Paid to Stockholders		(8,815)	(9,582)
Purchase and Retirement of Common Stock		(313,887)	(122,404)
Proceeds from Stock Option Exercises		1,767	1,992
Shares Redeemed to Settle Employee Taxes on Stock Compensation		(2,799)	(1,785)
Net Cash Used in Financing Activities		(48,734)	(121,779)
NET INCREASE IN CASH AND CASH EQUIVALENTS		45,083	(38,066)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD		8,601	48,068
CASH AND CASH EQUIVALENTS AT END OF PERIOD		53,684	10,002
Parent [Member] \| Reportable Legal Entities [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities		(21,193)	(69,161)
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment			(1,133)
Net Cash Used in Investing Activities			(1,133)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (Repayment) of Credit Facility		275,000	10,000
Dividends Paid to Stockholders		(8,815)	(9,582)
Purchase and Retirement of Common Stock		(313,887)	(122,404)
Proceeds from Stock Option Exercises		1,767	1,992
Shares Redeemed to Settle Employee Taxes on Stock Compensation		(2,799)	(1,785)
Intra-entity Activity, net		115,777	155,120
Net Cash Used in Financing Activities		67,043	33,341
NET INCREASE IN CASH AND CASH EQUIVALENTS		45,850	(36,953)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD		5,779	44,537
CASH AND CASH EQUIVALENTS AT END OF PERIOD		51,629	7,584
Guarantor Subsidiaries [Member] \| Reportable Legal Entities [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities		205,889	244,037
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment		(60,007)	(92,311)
Proceeds from Sale of Property, Plant, and Equipment			2,281
Acquisition Spending		(30,872)
Net Cash Used in Investing Activities		(90,879)	(90,030)
CASH FLOWS FROM FINANCING ACTIVITIES
Intra-entity Activity, net		(115,777)	(155,120)
Net Cash Used in Financing Activities		(115,777)	(155,120)
NET INCREASE IN CASH AND CASH EQUIVALENTS		(767)	(1,113)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD		2,822	3,531
CASH AND CASH EQUIVALENTS AT END OF PERIOD		$ 2,055	$ 2,418

Basis of Presentation - Additional Information (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease right-of-use asset	$ 63,526
Operating lease liabilities	67,901
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease right-of-use asset	66,700
Operating lease liabilities	$ 71,100

Acquisition - Additional Information (Detail) - USD ($) $ in Thousands		6 Months Ended
	Aug. 02, 2019	Sep. 30, 2019
Business Combinations [Abstract]
Purchase price of the acquisition	$ 30,900	$ 30,872
Date of acquisition of business	Aug. 02, 2019

Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Supply Commitment [Line Items]
Revenue recognized related to shortfall provisions	$ 1.6
Minimum [Member]
Supply Commitment [Line Items]
Long-term supply agreements maturity year		2019
Revenue from contract with customer collection terms		30 days
Maximum [Member]
Supply Commitment [Line Items]
Long-term supply agreements maturity year		2025
Revenue from contract with customer collection terms		65 days

Stockholders' Equity - Additional Information (Detail)	6 Months Ended
Stockholders' Equity - Additional Information (Detail)	Sep. 30, 2019 $ / shares shares
Equity [Abstract]
Repurchase of shares	3,574,109
Shares repurchased average price \| $ / shares	$ 87.82
Stock repurchase remaining number of shares authorized to be repurchased	7,305,649

Leases - Additional Information (Detail)	Sep. 30, 2019
Minimum [Member]
Lessee Lease Description [Line Items]
Operating lease term	1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Operating lease term	20 years

Inventories - Additional Information (Details) $ in Millions	6 Months Ended
	Sep. 30, 2019 USD ($)
Raw Materials and Materials-in-Process [Member]
Inventory [Line Items]
Inventory write-downs	$ 2.0
Frac Sand [Member]
Inventory [Line Items]
Inventory write-downs	$ 0.1

Schedule of Balance Sheet Information Related to Leases (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Operating Leases:
Operating Lease Right of Use Assets	$ 63,526
Current Operating Lease Liabilities	11,315
Noncurrent Operating Lease Liabilities	56,586
Total Operating Lease Liabilities	$ 67,901

Income Taxes - Additional Information (Detail)	6 Months Ended
Income Taxes - Additional Information (Detail)	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Effective tax rate	24.00%	21.00%

Schedule of Senior Unsecured Notes Redemption Prices (Detail) - 4.500% Senior Unsecured Notes Due 2026 [Member]	6 Months Ended
	Sep. 30, 2019
2021 [Member]
Debt Instrument Redemption [Line Items]
Redemption price, percentage	102.25%
2022 [Member]
Debt Instrument Redemption [Line Items]
Redemption price, percentage	101.50%
2023 [Member]
Debt Instrument Redemption [Line Items]
Redemption price, percentage	100.75%
2024 and Thereafter [Member]
Debt Instrument Redemption [Line Items]
Redemption price, percentage	100.00%

Segment Breakdown of Goodwill (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Segment Reporting Information [Line Items]
Goodwill	$ 200,009	$ 198,370
Cement [Member]
Segment Reporting Information [Line Items]
Goodwill	74,214	74,214
Gypsum Wallboard [Member]
Segment Reporting Information [Line Items]
Goodwill	116,618	116,618
Paperboard [Member]
Segment Reporting Information [Line Items]
Goodwill	7,538	$ 7,538
Concrete and Aggregates [Member]
Segment Reporting Information [Line Items]
Goodwill	$ 1,639

Commitments and Contingencies - Additional Information (Detail)	Sep. 30, 2019 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Letters of credit outstanding, amount	$ 6,900,000
Outstanding guarantees	0
Contingently liable for performance, current	$ 28,900,000

Fair Value of Senior Notes (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Series 2007A Tranche D [Member]
Fair Value Of Financial Instruments [Line Items]
Fair Value of Senior Notes	$ 36,508
4.500% Senior Unsecured Notes Due 2026 [Member]
Fair Value Of Financial Instruments [Line Items]
Fair Value of Senior Notes	$ 365,032