Eagle Materials (EXP) 10-Q 4 Feb 15 2015 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Dec. 31, 2014	Jan. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Trading Symbol	EXP
Entity Registrant Name	EAGLE MATERIALS INC
Entity Central Index Key	918646
Current Fiscal Year End Date	-28
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		50,277,425

Consolidated_Statements_of_Ear

Consolidated Statements of Earnings (unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Revenues	$291,529	$228,812	$842,588	$708,502
Cost of Goods Sold	212,380	178,964	631,977	552,571
Gross Profit	79,149	49,848	210,611	155,931
Equity in Earnings of Unconsolidated Joint Venture	12,423	9,856	34,274	27,481
Corporate General and Administrative Expense	-9,371	-6,796	-23,827	-18,450
Acquisition and Litigation Expense	-722		-2,825
Other Income	488	400	2,050	1,300
Interest Expense, Net	-4,101	-4,475	-12,054	-14,225
Earnings Before Income Taxes	77,866	48,833	208,229	152,037
Income Tax Expense	-25,836	-17,212	-68,170	-50,412
Net Earnings	$52,030	$31,621	$140,059	$101,625
EARNINGS PER SHARE:
Basic	$1.05	$0.64	$2.82	$2.07
Diluted	$1.03	$0.63	$2.78	$2.03
AVERAGE SHARES OUTSTANDING:
Basic	49,655,405	49,294,010	49,583,210	49,091,476
Diluted	50,411,147	50,162,962	50,375,619	49,948,178
CASH DIVIDENDS PER SHARE:	$0.10	$0.10	$0.30	$0.30

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Earnings (unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net Earnings	$52,030	$31,621	$140,059	$101,625
Change in Funded Status of Defined Benefit Plans:
Amortization of Net Actuarial Loss	163	238	489	714
Tax Expense	-57	-83	-171	-249
Comprehensive Earnings	$52,136	$31,776	$140,377	$102,090

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Current Assets -
Cash and Cash Equivalents	$13,697	$6,482
Accounts and Notes Receivable	136,823	102,917
Inventories	207,043	187,096
Prepaid and Other Assets	4,995	10,465
Total Current Assets	362,558	306,960
Property, Plant and Equipment -	1,929,177	1,660,975
Less: Accumulated Depreciation	-724,351	-676,924
Property, Plant and Equipment, net	1,204,826	984,051
Notes Receivable	2,890	3,063
Investment in Joint Venture	47,167	43,008
Goodwill and Intangible Assets	206,208	160,690
Other Assets	34,402	13,757
Total Assets	1,858,051	1,511,529
Current Liabilities -
Accounts Payable	68,466	57,098
Accrued Liabilities	45,269	41,520
Income Taxes Payable	1,508	702
Current Portion of Long-term Debt	57,045	9,500
Total Current Liabilities	172,288	108,820
Long-term Debt	460,714	371,759
Other Long-term Liabilities	84,911	53,678
Deferred Income Taxes	167,116	145,773
Total Liabilities	885,029	680,030
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 50,277,425 and 50,053,738 Shares, respectively	503	501
Capital in Excess of Par Value	269,736	253,524
Accumulated Other Comprehensive Losses	-5,165	-5,483
Retained Earnings	707,948	582,957
Total Stockholders’ Equity	973,022	831,499
Liabilities and Stockholders' Equity, Total	$1,858,051	$1,511,529

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Mar. 31, 2014
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	50,053,738	50,277,425
Common Stock, Outstanding	50,053,738	50,277,425

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net Earnings	$140,059	$101,625
Adjustments to Reconcile Net Earnings to Net Cash Provided by Operating Activities -
Depreciation, Depletion and Amortization	54,552	52,315
Deferred Income Tax Provision	1,172	3,939
Stock Compensation Expense	9,807	7,487
Excess Tax Benefits from Share Based Payment Arrangements	-3,493	-4,619
Equity in Earnings of Unconsolidated Joint Venture	-34,274	-27,481
Distributions from Joint Venture	30,125	29,250
Changes in Operating Assets and Liabilities:
Accounts and Notes Receivable	-19,093	-6,461
Inventories	-10,279	-19,489
Accounts Payable and Accrued Liabilities	6,352	-8,101
Other Assets	3,916	1,650
Income Taxes Payable	4,299	13,897
Net Cash Provided by Operating Activities	183,143	144,012
CASH FLOWS FROM INVESTING ACTIVITIES
Property, Plant and Equipment Additions	-64,959	-43,208
Acquisition	-237,171
Net Cash Used in Investing Activities	-302,130	-43,208
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (Decrease) in Credit Facility	146,000	-97,000
Repayment of Senior Notes	-9,500
Dividends Paid to Stockholders	-15,044	-14,903
Shares Redeemed to Settle Employee Taxes on Stock Compensation	-1,356	-489
Payment of Debt Acquisition Costs	-1,661
Proceeds from Stock Option Exercises	4,270	10,496
Excess Tax Benefits from Share Based Payment Arrangements	3,493	4,619
Net Cash Used in Financing Activities	126,202	-97,277
NET INCREASE IN CASH AND CASH EQUIVALENTS	7,215	3,527
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	6,482	3,897
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$13,697	$7,424

BASIS_OF_PRESENTATION

BASIS OF PRESENTATION	9 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
BASIS OF PRESENTATION	(A) BASIS OF PRESENTATION
	The accompanying unaudited consolidated financial statements as of and for the nine month period ended December 31, 2014 include the accounts of Eagle Materials Inc. and its majority-owned subsidiaries (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, 2014.
	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 revenues and expenses during the reporting period. Actual results could differ from those estimates.
	We have chosen to separately present certain costs on a single line item on our consolidated statement of earnings titled Acquisition and Litigation Expense.  These expenses consist of acquisition transaction costs of approximately $0.7 million and legal fees related to our lawsuit against the Internal Revenue Service (“IRS”) of approximately $2.8 million for the nine months ended December 31, 2014.  See Footnotes (B) and (O) to the Unaudited Consolidated Financial Statements for more information.
	Recent Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers.” ASU 2014-09 supersedes the revenue recognition requirements in “Revenue Recognition (Topic 605),” and requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. The standard will be effective for us in the first quarter of fiscal 2018, with early adoption not permitted. There are two transition methods available under the new standard, either cumulative effect or retrospective. We are currently evaluating the impact of this ASU and have not yet selected a transition method.

ACQUISITION

ACQUISITION	9 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
ACQUISITION	(B) ACQUISITION
	On November 14, 2014, Northern White Sand LLC (“NWS”), a wholly owned subsidiary of the Company, acquired all of the outstanding equity interest in CRS Holdco LLC, CRS Proppants LLC and Great Northern Sand LLC and related entities (collectively “CRS Proppants”) (such acquisition, the “Acquisition”).  CRS Proppants is a supplier of frac sand to the energy industry, and its business currently consists of a frac sand mine in New Auburn, Wisconsin, and a transload network into Texas and southwest Oklahoma.
	Purchase Price: The purchase price (the “Purchase Price”) of the Acquisition was approximately $237.2 million, including approximately $8.9 million of in-process capital expenditures paid as of the closing date.. The purchase price is subject to further adjustment to reflect actual working capital acquired at the closing. We funded the payment of the Purchase Price at closing and expenses incurred in connection with the Acquisition through borrowings under our bank credit facility, which was amended and restated on October 30, 2014.  See Footnote (L) to the Unaudited Consolidated Financial Statements for more information about the amended bank credit facility.
	Recording of assets acquired and liabilities assumed: The transaction has been accounted for using the acquisition method of accounting which requires, among other things, that assets acquired and liabilities assumed be recognized at their fair values as of the acquisition date. The Company has engaged a third-party to perform appraisal valuation to support the Company’s preliminary estimate of the fair value of certain assets acquired in the Acquisition.  The working capital amounts paid at the closing are subject to certain changes to reflect actual working capital.  Additionally, the amounts assigned to property, plant and equipment and intangible assets, are preliminary and subject to change, though it is possible other values may change as well.  Included in the assets acquired, and liabilities assumed, are two long-term sales agreements that included prepayments for future sales under the agreement, with such prepayments classified as liabilities.  Additionally, one of the agreements is with a customer that is currently in bankruptcy, and is not expected to fulfill its obligation under the contract.  We have been indemnified by the former owner against any loss related to this contract, and such indemnity has been valued at fair value and recorded as an asset at the date of the acquisition.
	The preparation of the valuation of the assets acquired and liabilities assumed in the Acquisition requires the use of significant assumptions and estimates.  Critical estimates include, but are not limited to, future expected cash flows, including projected revenues and expenses, and applicable discount rates.  These estimates are based on assumptions that the Company believes to be reasonable.  However, actual results may differ from these estimates.
	We will finalize the amounts recognized as the information necessary to complete the analyses is obtained. We expect to finalize these amounts during the fourth quarter of fiscal 2015. The following table summarizes the provisional allocation of the estimated Purchase Price to assets acquired and liabilities assumed as of the acquisition date:
	Purchase price allocation at acquisition date (in thousands)		As of
			14-Nov-14
	Cash and cash equivalents		$                219
	Accounts Receivable		14,640
	Inventories		9,668
	Prepaid and Other Assets		753
	Property and Equipment		203,637
	Intangible Assets		48,200
	Indemnity under Sales Agreement		14,813
	Other Assets		1,619
	Accounts Payable		(4,206)
	Accrued Liabilities		(2,072)
	Obligations under Long-term Sales Agreements		(30,100)
	Deferred Taxes		(20,000)
	Total Net Assets		237,171
	Goodwill		-
	Total Estimated Purchase Price		$         237,171
	Intangible Assets:  The following table is a summary of the preliminary fair value estimates of the identifiable intangible assets (in thousands) and their weighted-average useful lives:
		Weighted Average Life		Estimated Fair Value
	Customer Relationships	4		48,000
	Permits	40		200
	Total Intangible Assets			$  48,200
	Actual and pro forma impact of the Acquisition:  The following table presents the net sales and operating income of CRS Proppants that have been included in our consolidated statement of earnings from November 14, 2014 through the end of the quarter:
						Three Months Ended
						31-Dec-14
						(dollars in thousands)
	Revenues					$  9,452
	Operating Income					$     223
	Operating income shown above has been impacted by approximately $1.9 million of depreciation and amortization and approximately $0.7 million related to the impact of recording acquired inventory at fair value.
	The unaudited pro forma results presented below include the effects of the Acquisition of CRS Proppants as if it had been consummated as of April 1, 2013. The pro forma results include the amortization associated with an estimate for acquired intangible assets and interest expense associated with debt used to fund the Acquisition and depreciation from the fair value adjustments for property and equipment. To better reflect the combined operating results, material nonrecurring charges directly related to the Acquisition of $0.4 million and $1.1 million have been excluded from pro forma net income for the three and nine month periods ended December 31, 2014.
			For the Three Months Ended December 31,			For the Nine Months Ended December 31,
			2014		2013	2014	2013
			(dollars in thousands)			(dollars in thousands)
	Revenues		$    303,043		$     245,836	$    900,975	$     753,253
	Net Income		$      53,142		$       26,326	$    145,010	$       88,505
	Earnings per share – basis		$          1.07		$           0.53	$          2.92	$          1.80
	Earnings per share - diluted		$          1.05		$           0.52	$          2.88	$          1.77
	The pro forma results do not include any anticipated synergies or other expected benefits of the Acquisition.   Accordingly, the unaudited pro forma results are not necessarily indicative of either future results of operations or results that might have been achieved had the Acquisition been consummated as of April 1, 2013.

CASH_FLOW_INFORMATION_SUPPLEME

CASH FLOW INFORMATION - SUPPLEMENTAL	9 Months Ended
	Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract]
CASH FLOW INFORMATION - SUPPLEMENTAL	(C) CASH FLOW INFORMATION—SUPPLEMENTAL
	Cash payments made for interest were $13.6 million and $16.1 million for the nine months ended December 31, 2014 and 2013, respectively. Net payments made for federal and state income taxes during the nine months ended December 31, 2014 and 2013, were $60.0 million and $32.6 million, respectively.
	We have excluded approximately $4.1 million of non-cash investing activities from the statement of cash flows related to the purchase of capital equipment.  The $4.1 million accrued at December 31, 2014 was paid in January 2015.

ACCOUNTS_AND_NOTES_RECEIVABLE

ACCOUNTS AND NOTES RECEIVABLE	9 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
ACCOUNTS AND NOTES RECEIVABLE	(D) ACCOUNTS AND NOTES RECEIVABLE
	Accounts and notes receivable have been shown net of the allowance for doubtful accounts of $6.9 million and $5.8 million at December 31, 2014 and March 31, 2014, respectively. We perform ongoing credit evaluations of our customers’ financial condition and generally require no collateral from our customers. The allowance for non-collection of receivables is based upon analysis of economic trends in the construction industry, detailed analysis of the expected collectability of accounts receivable that are past due and the expected collectability of overall receivables. We have no significant credit risk concentration among our diversified customer base.
	We had notes receivable totaling approximately $3.4 million at December 31, 2014, of which approximately $0.5 million has been classified as current and presented with accounts receivable on the balance sheet. We lend funds to certain companies in the ordinary course of business, and the notes bear interest, on average, at LIBOR plus 3.5%. Remaining unpaid amounts, plus accrued interest, mature on various dates between 2014 and 2017. The notes are collateralized by certain assets of the borrowers, namely property and equipment, and are generally payable monthly. We monitor the credit risk of each borrower by focusing on the timeliness of payments, review of credit history and credit metrics and interaction with the borrowers.

STOCKHOLDERS_EQUITY

STOCKHOLDERS' EQUITY	9 Months Ended
	Dec. 31, 2014
Equity [Abstract]
STOCKHOLDERS' EQUITY	(E) STOCKHOLDERS’ EQUITY
	A summary of changes in stockholders’ equity follows:
		For the Nine Months
		Ended December 31, 2014
		(dollars in thousands)
	Common Stock –
	Balance at Beginning of Period	$	501
	Stock Option Exercises		2
			503
	Balance at End of Period
	Capital in Excess of Par Value –
	Balance at Beginning of Period		253,524
	Stock Compensation Expense		13,299
	Shares Redeemed to Settle Employee Taxes		(1,356	)
	Stock Option Exercises		4,269
			269,736
	Balance at End of Period
	Retained Earnings –
	Balance at Beginning of Period		582,957
	Dividends Declared to Stockholders		(15,068	)
	Net Earnings		140,059
			707,948
	Balance at End of Period
	Accumulated Other Comprehensive Loss -
	Balance at Beginning of Period		(5,483	)
	Change in Funded Status of Pension Plan, net of tax		318
	Balance at End of Period		(5,165	)
		$	973,022
	Total Stockholders’ Equity
	There were no open market share repurchases during the three and nine month periods ended December 31, 2014. As of December 31, 2014, we have authorization to purchase an additional 717,300 shares.

INVENTORIES

INVENTORIES	9 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
INVENTORIES	(F) INVENTORIES
	Inventories are stated at the lower of average cost (including applicable material, labor, depreciation, and plant overhead) or market, and consist of the following:
		As of
		December 31,		March 31,
		2014		2014
		(dollars in thousands)
	Raw Materials and Material-in-Progress	$	100,377	$	82,319
	Finished Cement		16,546		19,173
	Gypsum Wallboard		6,108		7,144
	Frac Sand		3,497		275
	Aggregates		10,821		11,815
	Paperboard		3,996		4,102
	Repair Parts and Supplies		60,103		56,119
	Fuel and Coal		5,595		6,149
		$	207,043	$	187,096

ACCRUED_EXPENSES

ACCRUED EXPENSES	9 Months Ended
	Dec. 31, 2014
Payables And Accruals [Abstract]
ACCRUED EXPENSES	(G) ACCRUED EXPENSES
	Accrued expenses consist of the following:
		As of
		December 31,		March 31,
		2014		2014
		(dollars in thousands)
	Payroll and Incentive Compensation	$	20,324	$	12,855
	Benefits		10,185		10,158
	Interest		1,874		4,813
	Property Taxes		1,538		2,801
	Power and Fuel		2,179		2,132
	Sales and Use Tax		694		658
	Legal		847		1,831
	Acquisition and Litigation		300		-
	Other		7,328		6,272
		$	45,269	$	41,520

SHAREBASED_EMPLOYEE_COMPENSATI

SHARE-BASED EMPLOYEE COMPENSATION	9 Months Ended
	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
SHARE-BASED EMPLOYEE COMPENSATION	(H) 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 June 2014, the Compensation Committee approved an incentive equity award of an aggregate of 193,636 stock options pursuant to the Plan to certain officers and key employees (the “Fiscal 2015 Employee Stock Option Grant”) that will be earned if our ten year return on equity is at least 15% at March 31, 2015. If this criterion is not met, all of the options will be forfeited. If the criterion is met, the award may be reduced by the Compensation Committee based on individual performance goals. Following any such reduction, the earned options will vest ratably over three years, with the first third vesting promptly following the determination date, and the remaining options vesting on March 31, 2016 and 2017. The stock options have a term of ten years from the date of grant. In August 2014, we granted 18,515 options to members of the Board of Directors (the “Fiscal 2015 Board of Directors Grant”). Options granted under the Fiscal 2015 Board of Directors Grant vest immediately and can be exercised from the date of grant until their expiration on the tenth anniversary of the date of grant.
	The Fiscal 2015 Employee Stock Option Grant and Fiscal 2015 Board of Directors Grants were valued at the grant date using the Black-Scholes option pricing model. The weighted-average assumptions used in the Black-Scholes model to value the option awards in fiscal 2015 are as follows:
		Fiscal 2015
	Dividend Yield		2.00%
	Expected Volatility		44.80%
	Risk Free Interest Rate		1.80%
	Expected Life		6.0 years
	Stock option expense for all outstanding stock option awards totaled approximately $1.4 million and $4.8 million for the three and nine month periods ended December 31, 2014, respectively, and $1.3 million and $4.0 million for the three and nine month periods ended December 31, 2013, respectively. At December 31, 2014, there was approximately $13.0 million of unrecognized compensation cost related to outstanding stock options, net of estimated forfeitures, which is expected to be recognized over a weighted-average period of 3.4 years.
	The following table represents stock option activity for the nine month period ended December 31, 2014:
		Number			Weighted-
		of			Average
		Shares			Exercise Price
	Outstanding Options at Beginning of Period		2,788,999		$	41.83
	Granted		297,151		$	86.41
	Exercised		(149,585	)	$	32.43
	Cancelled		(1,269,500	)	$	47.43
	Outstanding Options at End of Period		1,667,065		$	46.35
	Options Exercisable at End of Period		1,035,166		$	34.45
	Weighted-Average Fair Value of Options Granted during the Period	$	32.31
	During the quarter ended June 30, 2014, approximately 1,270,000 options expired without the performance criteria having been met.
	The following table summarizes information about stock options outstanding at December 31, 2014:
		Outstanding Options							Exercisable Options
	Range of Exercise Prices	Number of			Weighted -		Weighted -		Number of		Weighted -
		Shares			Average		Average		Shares		Average
		Outstanding			Remaining		Exercise		Outstanding		Exercise
					Contractual		Price				Price
					Life
	$23.17 – $ 30.74		593,710			4.45	$	26.5		590,710	$	26.48
	$33.08 – $ 40.78		487,968			7.16	$	33.95		308,352	$	34
	$53.22 – $ 74.10		283,236			8.07	$	66.58		117,589	$	66.57
	$79.90 – $ 93.56		302,151			9.56	$	86.42		18,515	$	91.95
			1,667,065			6.78	$	46.35		1,035,166	$	34.45
	At December 31, 2014, the aggregate intrinsic value for outstanding and exercisable options was approximately $49.5 million and $43.1 million, respectively. The total intrinsic value of options exercised during the nine month period ended December 31, 2014 was approximately $9.5 million.
	Restricted Stock. In June 2014, the Compensation Committee approved the granting of an aggregate of 80,416 shares of restricted stock to certain officers and key employees (the “Fiscal 2015 Employee Restricted Stock Award”) that will be earned if our ten year return on equity is at least 15% at March 31, 2015. If this criterion is not met, all of the shares will be forfeited. If the criterion is met, the award may be reduced by the Compensation Committee based on individual performance goals. Following any such reduction, restrictions on the earned shares will lapse ratably over five years, with the first fifth lapsing promptly following the determination date, and the remaining restrictions lapsing on March 31, 2016 through 2019. The value of the Fiscal 2015 Employee Restricted Stock Award, net of estimated forfeitures, is being expensed over a five year period. In August 2014, we granted 7,457 shares of restricted stock to members of the Board of Directors (the “Board of Directors Fiscal 2015 Restricted Stock Award”). Awards issued under the Board of Directors Fiscal 2015 Restricted Stock Award do not fully vest until the retirement of each director, in accordance with the Company’s director retirement policy.
	Expense related to restricted shares was approximately $1.7 million and $5.0 million for the three and nine month periods ended December 31, 2014, respectively, and $1.3 million and $3.4 million for the three and nine month periods ended December 31, 2013, respectively. At December 31, 2014, there was approximately $18.7 million of unearned compensation from restricted stock, net of estimated forfeitures, which will be recognized over a weighted-average period of 2.7 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 4,873,975 at December 31, 2014.

COMPUTATION_OF_EARNINGS_PER_SH

COMPUTATION OF EARNINGS PER SHARE	9 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
COMPUTATION OF EARNINGS PER SHARE	(I) COMPUTATION OF EARNINGS PER SHARE
	The calculation of basic and diluted common shares outstanding is as follows:
		For the Three Months						For the Nine Months
		Ended December 31,						Ended December 31,
		2014			2013			2014			2013
	Weighted-Average Shares of Common Stock Outstanding		49,655,405			49,294,010			49,583,210			49,091,476
	Common Equivalent Shares:
	Assumed Exercise of Outstanding Dilutive Options		1,349,997			1,559,885			1,418,957			1,648,483
	Less: Shares Repurchased from Assumed Proceeds of Assumed Exercised Options		(893,874	)		(1,011,617	)		(920,113	)		(1,095,651	)
	Restricted Shares		299,619			320,684			293,565			303,870
	Weighted-Average Common and Common Equivalent Shares Outstanding		50,411,147			50,162,962			50,375,619			49,948,178
	Shares Excluded Due to Anti-dilution Effects		279,651			216,914			206,702			124,970

PENSION_AND_EMPLOYEE_BENEFIT_P

PENSION AND EMPLOYEE BENEFIT PLANS	9 Months Ended
	Dec. 31, 2014
Compensation And Retirement Disclosure [Abstract]
PENSION AND EMPLOYEE BENEFIT PLANS	(J) PENSION AND EMPLOYEE BENEFIT PLANS
	We sponsor several defined benefit and defined contribution pension 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						For the Nine Months ended
		December 31,						December 31,
		2014			2013			2014			2013
			(dollars in thousands)						(dollars in thousands)
	Service Cost – Benefits Earned During the Period	$	224		$	360		$	696		$	753
	Interest Cost of Benefit Obligations		324			306			954			917
	Expected Return on Plan Assets		(426	)		(410	)		(1,254	)		(1,096	)
	Recognized Net Actuarial Loss		150			215			460			707
	Amortization of Prior-Service Cost		3			1			9			9
	Net Periodic Pension Cost	$	275		$	472		$	865		$	1,290

INCOME_TAXES

INCOME TAXES	9 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
INCOME TAXES	(K) INCOME TAXES
	Income taxes for the interim period presented have been included in the accompanying financial statements on the basis of an estimated annual effective tax rate. In addition to the amount of tax resulting from applying the estimated annual effective tax rate to pre-tax income, we will, when appropriate, include certain items treated as discrete events to arrive at an estimated overall tax amount. The effective tax rate for both the three and nine months ended December 31, 2014 was approximately 33%, which increased from the prior year due to the reduction in the impact of our depletion deduction as a result of increased earnings in fiscal year 2015.
	In September 2013, the Internal Revenue Service enacted final guidance regarding the deduction and capitalization of expenditures related to tangible property (“tangible property regulations”). The tangible property regulations clarify and expand sections 162(a) and 263(a) of the Internal Revenue Code which relate to amounts paid to acquire, produce, or improve tangible property. Additionally, the tangible property regulations provide final guidance under section 167 regarding accounting for and retirement of depreciable property and regulations under section 168 relating to the accounting for property under the Modified Accelerated Cost Recovery System. The tangible property regulations affect all taxpayers that acquire, produce, or improve tangible property, which includes the Company, and generally apply to taxable years beginning on or after January 1, 2014, which will impact us for the fiscal year ending March 31, 2015. We have evaluated the tangible property regulations and determined the regulations will not have a material impact on our financial condition, results of operations or cash flows.

LONGTERM_DEBT

LONG-TERM DEBT	9 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
LONG-TERM DEBT	(L) LONG-TERM DEBT
	Long-term debt consists of the following:
		As of
		December 31,			March 31,
		2014			2014
		(dollars in thousands)
	Credit Facility	$	335,000		$	189,000
	Senior Notes		182,759			192,259
	Total Debt		517,759			381,259
	Less: Current Portion of Long-term Debt		(57,045	)		(9,500	)
	Total Debt	$	460,714		$	371,759
	Credit Facility –
	Our Credit Facility was amended and restated on October 30, 2014 (the “Amended Credit Facility”).  The Amended Credit Facility increased available borrowings from $400.0 million to $500.0 million and extended the term from December 15, 2015 to October 30, 2019. Borrowings under the Amended Credit Facility are guaranteed by substantially all of the Company’s subsidiaries. At the option of the Company, outstanding principal amounts on the Amended Credit Facility bear interest at a variable rate equal to (i) LIBOR, plus an agreed margin (ranging from 100 to 225 basis points), which is to be established quarterly based upon 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 agreed margin (ranging from 0 to 125 basis points). Interest payments are payable, in the case of loans bearing interest at a rate based on the federal funds rate, quarterly, or in the case of loans bearing interest at a rate based on LIBOR, at the end of the LIBOR advance periods, which can be a period of 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 Amended Credit Facility ranging from 10 to 35 basis points depending upon the Leverage Ratio. The Amended 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 Amended 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 had $335.0 million of borrowings outstanding at December 31, 2014. Based on our Leverage Ratio, we had $155.8 million of available borrowings, net of the outstanding letters of credit, at December 31, 2014.
	The Amended Credit Facility has a $50.0 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 December 31, 2014, we had $9.2 million of letters of credit outstanding.
	Senior Notes -
	We entered into a Note Purchase Agreement on November 15, 2005 (the “2005 Note Purchase Agreement”) related to our sale of $200 million of senior, unsecured notes, designated as Series 2005A Senior Notes (the “Series 2005A Senior Notes”) in a private placement transaction. The Series 2005A Senior Notes, which are guaranteed by substantially all of our subsidiaries, were sold at par and issued in three tranches on November 15, 2005. Since entering into the 2005 Note Purchase Agreement, we have repurchased $81.1 million in principal of the Series 2005A Senior Notes (in periods prior to the fiscal year ended March 31, 2013). During November 2012, Tranche A of the Series 2005A Senior Notes matured and we retired the remaining $4.7 million in notes from this Tranche. Following these repurchases and maturities, the amounts outstanding for each of the remaining tranches are as follows:
		Principal			Maturity Date			Interest Rate
	Tranche B	$	57.0 million			November 15, 2015			5.38%
	Tranche C	$	57.2 million			November 15, 2017			5.48%
	Interest for each tranche of Notes is payable semi-annually on the 15th day of May and the 15th day of November of each year until all principal is paid for the respective tranche.
	We also entered into an additional Note Purchase Agreement on October 2, 2007 (the “2007 Note Purchase Agreement”) related to our sale of $200 million of senior, unsecured notes, designated as Series 2007A Senior Notes (the “Series 2007A Senior Notes”) in a private placement transaction. The Series 2007A Senior Notes, which are guaranteed by substantially all of our subsidiaries, were sold at par and issued in four tranches on October 2, 2007. Since entering into the 2007 Note Purchase Agreement, we have repurchased $122.0 million in principal of the Series 2007A Senior Notes (in periods prior to the fiscal year ended March 31, 2013). During October 2014, Tranche A of the Series 2007A Senior Notes matured and we retired the remaining $9.5 million in notes from this Tranche. Following the repurchase, the amounts outstanding for each of the four tranches are as follows:
		Principal			Maturity Date			Interest Rate
	Tranche B	$	8.0 million			October 2, 2016			6.27%
	Tranche C	$	24.0 million			October 2, 2017			6.36%
	Tranche D	$	36.5 million			October 2, 2019			6.48%
	Interest for each tranche of Notes is payable semi-annually on the second day of April and the second day of October of each year until all principal is paid for the respective tranche.
	Our obligations under the 2005 Note Purchase Agreement and the 2007 Note Purchase Agreement (collectively referred to as the “Note Purchase Agreements”) and the Series 2005A Senior Notes and the Series 2007A Senior Notes (collectively referred to as “the Senior Notes”) are equal in right of payment with all other senior, unsecured debt of the Company, including our debt under the Amended Credit Facility. The Note Purchase Agreements contain customary restrictive covenants, including covenants that place limits on our ability to encumber our assets, to incur additional debt, to sell assets, or to merge or consolidate with third parties, as well as certain cross covenants with the Amended Credit Facility. We were in compliance with all financial ratios and tests at December 31, 2014 and throughout the fiscal year.
	Pursuant to a Subsidiary Guaranty Agreement, substantially all of our subsidiaries have guaranteed the punctual payment of all principal, interest, and Make-Whole Amounts (as defined in the Note Purchase Agreements) on the Senior Notes and the other payment and performance obligations of the Company contained in the Senior Notes and in the Note Purchase Agreements. We are permitted, at our option and without penalty, to prepay from time to time at least 10% of the original aggregate principal amount of the Senior Notes at 100% of the principal amount to be prepaid, together with interest accrued on such amount to be prepaid to the date of payment, plus a Make-Whole Amount. The Make-Whole Amount is computed by discounting the remaining scheduled payments of interest and principal of the Senior Notes being prepaid at a discount rate equal to the sum of 50 basis points and the yield to maturity of U.S. treasury securities having a maturity equal to the remaining average life of the Senior Notes being prepaid.
	We are leasing 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 are the holder of all of the outstanding industrial revenue bonds, no debt is reflected on our financial statements in connection with our lease of the cement plant. At the conclusion of the lease in fiscal 2021, we have the option to purchase the cement plant for a nominal amount.

SEGMENT_INFORMATION

SEGMENT INFORMATION	9 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
SEGMENT INFORMATION	(M) SEGMENT INFORMATION
	Operating segments are defined as components of an enterprise that engage in business activities that earn revenues, 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. During the quarter ended June 30, 2014, we changed our segment presentation to reflect Oil and Gas Proppants, which had been included in Concrete and Aggregates, as a separate segment. We have adjusted the prior period segment presentation to reflect this change for comparative purposes.
	We operate in five business segments: Cement, Gypsum Wallboard, Recycled Paperboard, Concrete and Aggregates and Oil and Gas Proppants, with Gypsum Wallboard and Cement currently being our principal lines of business. These operations are conducted in the U.S. and include the mining of limestone and the manufacture, production, distribution and sale of Portland cement (a basic construction material which is the essential binding ingredient in concrete), the mining of gypsum and 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”). These products are used primarily in commercial and residential construction, public construction projects and projects to build, expand and repair roads and highways and in oil and natural gas extraction.
	We operate six cement plants, sixteen cement distribution terminals, five gypsum wallboard plants, including the plant temporarily idled in Bernalillo, N.M., a gypsum wallboard distribution center, a recycled paperboard mill, seventeen readymix concrete batch plant locations, four aggregates processing plant locations, two frac sand mines, two frac sand processing facilities and five frac sand transload locations. The principal markets for our cement products are Texas, northern Illinois (including Chicago), the central plains, the Rocky Mountains, northern Nevada, and northern California. Gypsum wallboard and recycled paperboard are distributed throughout the continental U.S, with the exception of the northeast. Concrete and aggregates are sold to local readymix producers and paving contractors in the Austin, Texas area, north of Sacramento, California and the greater Kansas City, Missouri area, while frac sand is currently sold into shale deposit zones across the United States.
	We conduct one of our six cement plant operations, Texas Lehigh Cement Company LP in Buda, Texas, through a Joint Venture. For segment reporting purposes only, we proportionately consolidate our 50% share of the Joint Venture’s revenues and operating earnings, which is consistent with the way management reports the segments within the Company for making operating decisions and assessing performance.
	We account for intersegment sales at market prices. The following table sets forth certain financial information relating to our operations by segment:
		For the Three Months						For the Nine Months
		Ended December 31,						Ended December 31,
		2014			2013			2014			2013
		(dollars in thousands)						(dollars in thousands)
	Revenues -
	Cement	$	124,048		$	105,578		$	397,845		$	356,482
	Gypsum Wallboard		118,573			104,158			342,905			299,099
	Paperboard		39,936			33,696			112,994			100,501
	Oil and Gas Proppants		31,731			3,960			53,325			6,152
	Concrete and Aggregates		27,116			24,376			85,239			77,487
	Sub-total		341,404			271,768			992,308			839,721
	Less: Intersegment Revenues		(16,968	)		(16,766	)		(51,096	)		(49,247	)
	Net Revenues, including Joint Venture		324,436			255,002			941,212			790,474
	Less: Joint Venture		(32,907	)		(26,190	)		(98,624	)		(81,972	)
	Net Revenues	$	291,529		$	228,812		$	842,588		$	708,502
		For the Three Months						For the Nine Months
		Ended December 31,						Ended December 31,
		2014			2013			2014			2013
		(dollars in thousands)						(dollars in thousands)
	Intersegment Revenues -
	Cement	$	2,489		$	2,556		$	7,760		$	7,503
	Paperboard		14,305			13,993			42,645			40,855
	Concrete and Aggregates		174			217			691			889
		$	16,968		$	16,766		$	51,096		$	49,247
	Cement Sales Volume (in thousands of tons) -
	Wholly –owned Operations		935			876			3,135			3,037
	Joint Venture		270			239			837			753
			1,205			1,115			3,972			3,790
		For the Three Months						For the Nine Months
		Ended December 31,						Ended December 31,
		2014			2013			2014			2013
		(dollars in thousands)						(dollars in thousands)
	Operating Earnings -
	Cement	$	37,578		$	26,011		$	96,535		$	77,451
	Gypsum Wallboard		40,013			30,730			114,443			90,234
	Paperboard		9,102			6,661			24,633			19,277
	Oil and Gas Proppants		3,241			(2,162	)		3,315			(3,968	)
	Concrete and Aggregates		1,638			(1,536	)		5,959			418
	Other, net		488			400			2,050			1,300
	Sub-total		92,060			60,104			246,935			184,712
	Corporate General and Administrative		(9,371	)		(6,796	)		(23,827	)		(18,450	)
	Acquisition and Litigation Expense		(722	)		-			(2,825	)		-
	Earnings Before Interest and Income Taxes		81,967			53,308			220,283			166,262
	Interest Expense, net		(4,101	)		(4,475	)		(12,054	)		(14,225	)
	Earnings Before Income Taxes	$	77,866		$	48,833		$	208,229		$	152,037
	Cement Operating Earnings -
	Wholly–owned Operations	$	25,155		$	16,155		$	62,261		$	49,970
	Joint Venture		12,423			9,856			34,274			27,481
		$	37,578		$	26,011		$	96,535		$	77,451
	Capital Expenditures -
	Cement	$	3,890		$	2,657		$	16,886		$	8,493
	Gypsum Wallboard		1,154			1,284			4,947			2,983
	Paperboard		303			902			1,452			2,803
	Oil and Gas Proppants		18,421			5,533			32,023			26,549
	Concrete and Aggregates		1,128			1,135			9,477			2,266
	Other		24			114			174			114
		$	24,920		$	11,625		$	64,959		$	43,208
	Depreciation, Depletion and Amortization -
Cement	$	8,089		$	8,036		$	23,959		$	23,684
Gypsum Wallboard		4,967			5,239			15,096			15,783
Paperboard		2,069			2,205			6,196			6,558
Oil and Gas Proppants		2,673			475			3,926			1,160
Concrete and Aggregates		1,465			1,300			4,058			4,001
Other, net		425			436			1,317			1,129
	$	19,688		$	17,691		$	54,552		$	52,315
	As of
	December 31,			March 31,
	2014			2014
	(dollars in thousands)
Identifiable Assets -
Cement	$	759,143		$	762,578
Gypsum Wallboard		408,097			412,566
Paperboard		123,131			125,045
Oil and Gas Proppants		448,155			71,366
Concrete and Aggregates		95,303			108,197
Corporate and Other		24,222			31,777
	$	1,858,051		$	1,511,529
Segment operating earnings, including the proportionately consolidated 50% interest in the revenues and expenses of the Joint Venture, represent revenues, less direct operating expenses, segment depreciation, and segment selling, general and administrative expenses. Corporate assets consist primarily of cash and cash equivalents, general office assets, miscellaneous other assets and unrecognized tax benefits. The segment breakdown of goodwill is as follows:
	As of
	December 31,			March 31,
	2014			2014
	(dollars in thousands)
Cement	$	8,359		$	8,359
Gypsum Wallboard		116,618			116,618
Paperboard		7,538			7,538
	$	132,515		$	132,515
We perform our annual test of impairment on goodwill during the fourth quarter of our fiscal year. If business conditions in the operating units containing goodwill change substantially during the fiscal year, and we are unable to conclude that an impairment loss is not likely to occur, we will perform impairment tests for those business units during our quarterly periods. At December 31, 2014, we determined that impairment losses are not likely to occur; therefore, no impairment tests were performed during the quarter.
We temporarily idled our gypsum manufacturing facility in Bernalillo, N.M. beginning in December 2009, due to cyclical low gypsum wallboard demand. The carrying value of the Bernalillo plant was $2.8 million, and the carrying value of the equipment was $0.7 million at December 31, 2014, and we continue to depreciate the assets over their estimated useful life. We currently have a strong market position in New Mexico, and our Albuquerque gypsum wallboard facility is operating at close to capacity. We plan on resuming manufacturing at the Bernalillo facility in the future when demand for our products increases. Costs of maintaining the facility during the idling are not significant, and the facility was generating positive cash flow prior to being idled; therefore, we have determined that the value of the plant and equipment is not impaired. We are not currently considering the permanent closure of the Bernalillo facility. Any decision to permanently close Bernalillo would be the result of future changes in the building materials industry in the southwest United States and Rocky Mountain region, including changes in the production capacity or operations of our competitors, demand for gypsum wallboard or general macro-economic conditions, which we do not foresee at the present time. If we were to permanently close the Bernalillo facility, or if our expectations as to its use changed such that we project the future undiscounted cash flows from its operations would be insufficient to recover its carrying value due to the factors described above, or for any other reason, we would recognize impairment at that time. All of our other wallboard facilities are currently generating positive cash flow from operations.
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						For the Nine Months
	Ended December 31,						Ended December 31,
	2014			2013			2014			2013
	(dollars in thousands)						(dollars in thousands)
Revenues	$	65,815		$	52,380		$	197,249		$	163,944
Gross Margin	$	26,445		$	20,513		$	72,282		$	57,848
Earnings Before Income Taxes	$	24,846		$	19,712		$	68,548		$	54,962
	As of
	December 31,			March 31,
	2014			2014
	(dollars in thousands)
Current Assets	$	68,161		$	59,029
Non-Current Assets	$	43,281		$	42,826
Current Liabilities	$	20,961		$	17,901

INTEREST_EXPENSE

INTEREST EXPENSE	9 Months Ended
	Dec. 31, 2014
Banking And Thrift Interest [Abstract]
INTEREST EXPENSE	(N) INTEREST EXPENSE
	The following components are included in interest expense, net:
		For the Three Months						For the Nine Months
		Ended December 31,						Ended December 31,
		2014			2013			2014			2013
		(dollars in thousands)						(dollars in thousands)
	Interest (Income)	$	(2	)	$	(1	)	$	(5	)	$	(3	)
	Interest Expense		3,730			4,102			10,901			13,071
	Interest Expense – Income Taxes		174			155			522			481
	Other Expenses		199			219			636			676
	Interest Expense, net	$	4,101		$	4,475		$	12,054		$	14,225
	Interest income includes interest on investments of excess cash. Components of interest expense include interest associated with the Senior Notes, the Amended Credit Facility and commitment fees based on the unused portion of the Amended Credit Facility. Other expenses include amortization of debt issuance costs, and credit facility costs.
	Interest Expense – Income Taxes relates to interest accrued on our unrecognized tax benefits, primarily related to the Republic Asset Acquisition.

COMMITMENTS_AND_CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
	Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	(O) COMMITMENTS AND CONTINGENCIES
	We have certain deductible limits under our workers’ compensation and liability insurance policies for which reserves are established based on the undiscounted estimated costs of known and anticipated claims. We have entered into standby letter of credit agreements relating to workers’ compensation and auto and general liability self-insurance. At December 31, 2014, we had contingent liabilities under these outstanding letters of credit of approximately $9.2 million.
	In the ordinary course of business, we execute contracts involving indemnifications that are standard in the industry and indemnifications specific to a transaction such as sale of a business. These indemnifications may include claims relating to any of the following: environmental and tax matters; intellectual property rights; governmental regulations and employment-related matters; customer, supplier, and other commercial contractual relationships; construction contracts and financial matters. While the maximum amount to which the Company may be exposed under such agreements cannot be estimated, it is the opinion of management that these indemnifications are not expected to have a material adverse effect on our consolidated financial position, results of operations or cash flows. We currently have no outstanding guarantees.
	We are currently contingently liable for performance under $14.3 million in performance bonds required by certain states and municipalities, and their related agencies. The bonds are principally for certain reclamation obligations and mining permits. We have indemnified the underwriting insurance company against any exposure under the performance bonds. In our past experience, no material claims have been made against these financial instruments.
	Outstanding Lawsuit against the IRS
	As previously reported, the IRS completed the examination of our federal income tax returns for all of the fiscal years ended March 31, 2001 through 2006. The IRS issued Exam Reports and Notices of Proposed Adjustment on November 9, 2007 for the examination of the 2001, 2002 and 2003 tax years, and on February 5, 2010 for the examination of the 2004, 2005 and 2006 fiscal years, in which it denied certain depreciation deductions claimed by us with respect to assets acquired by us from Republic Group LLC in November 2000. In response to the examination reports, we previously paid an aggregate amount to the IRS, net of certain refunds of interest, of $97.9 million of taxes, penalties and interest with respect to these fiscal years. On May 4, 2011, we filed a lawsuit in Federal District Court to recover the $97.9 million of taxes, penalties and interest paid. In March 2013, the IRS agreed to suspend the audit for tax years 2007 through 2011 pending the outcome of our case before the Federal District Court.  In September 2013, the judge heard arguments on each party’s motion for summary judgment and in November 2013 the judge denied each such motion.
	In September 2014 the Company and the IRS reached a tentative agreement to settle this case, and this agreement was approved by the U.S Department of Justice in January 2015.  Under the terms of the agreement, we dismissed our lawsuit seeking to recover taxes, interest and penalties paid, as discussed above, in exchange for the IRS conceding 40% of the penalties, plus related interest, to date. We will recognize the recovery of 40% of the penalties, which total approximately $5.8 million, plus approximately $3.4 million of  related interest thereon, in our consolidated statement of earnings during the fourth quarter of fiscal 2015.
	EPA Notice of Violation
	On October 5, 2010, Region IX of the EPA issued a Notice of Violation and Finding of Violation (“NOV”) alleging violations by our subsidiary, Nevada Cement Company (“NCC”), of the Clean Air Act (“CAA”). The NOV alleges that NCC made certain physical changes to its facility in the 1990s without first obtaining permits required by the Prevention of Significant Deterioration requirements and Title V permit requirements of the CAA. The EPA also alleges that NCC has failed to submit to the EPA since 2002 certain reports required by the National Emissions Standard for Hazardous Air Pollutants General Provisions and the Portland Cement Manufacturing Industry Standards. On March 12, 2014, EPA Region IX issued a second NOV to NCC. The second NOV is materially similar to the 2010 NOV except that it alleges violations of the new source performance standards (“NSPS”) for Portland cement plants. The NOVs state that the EPA may seek penalties although it does not propose or assess any specific level of penalties or specify what relief the EPA will seek for the alleged violations. NCC believes it has meritorious defenses to the allegations in the NOVs. NCC met with the EPA in December 2010, September 2012 and May 2014 to present its defenses and to discuss a resolution of the alleged violations. EPA and NCC remain in discussions regarding the alleged violations. If a negotiated settlement cannot be reached, NCC intends to vigorously defend these matters in any enforcement action that may be pursued by the EPA. As a part of a settlement, or should NCC fail in its defense in any enforcement action, NCC could be required to make substantial capital expenditures to modify its facility and incur increased operating costs. NCC could also be required to pay significant civil penalties. Additionally, an enforcement action could take many years to resolve the underlying issues alleged in the NOV. We are currently unable to determine the final outcome of this matter or the impact of an unfavorable determination upon our financial position or results of operations.
	Domestic Wallboard Antitrust Litigation
	Since late December 2012, several purported class action lawsuits were filed in various United States district courts, including the Eastern District of Pennsylvania, Western District of North Carolina and the Northern District of Illinois, against the Company’s subsidiary, American Gypsum Company LLC (“American Gypsum”), alleging that American Gypsum conspired with other wallboard manufacturers to fix the price for drywall sold in the United States in violation of federal antitrust laws and, in some cases related provisions of state law. The complaints allege that the defendant wallboard manufacturers conspired to increase prices through the announcement and implementation of coordinated price increases, output restrictions, and other restraints of trade, including the elimination of individual “job quote” pricing. In addition to American Gypsum, the defendants in these lawsuits include CertainTeed Corp., USG Corporation and United States Gypsum (together “USG”), New NGC, Inc., Lafarge North America, Temple Inland Inc. and PABCO Building Products LLC.  On April 8, 2013, the Judicial Panel on Multidistrict Litigation transferred and consolidated all related cases to the Eastern District of Pennsylvania for coordinated pretrial proceedings.
	On June 24, 2013, the direct and indirect purchaser plaintiffs filed consolidated amended class action complaints. The direct purchasers’ complaint added the Company as a defendant. The plaintiffs in the consolidated class action lawsuits bring claims on behalf of purported classes of direct or indirect purchasers of wallboard from January 1, 2012 to the present for unspecified monetary damages (including treble damages) and in some cases injunctive relief. On July 29, 2013, the Company and American Gypsum answered the complaints, denying all allegations that they conspired to increase the price of drywall and asserting affirmative defenses to the plaintiffs’ claims.
	On November 3, 2014 USG announced that it had entered into a binding memorandum of understanding with counsel representing the direct and indirect purchasers classes pursuant to which it agreed to settle all claims against it. Discovery in this litigation is ongoing.  Due to the fact that the case is in the discovery phase, we are unable to estimate the amount of any reasonably possible loss or range of reasonably possible losses. American Gypsum denies the allegations in these lawsuits and will vigorously defend itself against these claims.

FAIR_VALUE_OF_FINANCIAL_INSTRU

FAIR VALUE OF FINANCIAL INSTRUMENTS	9 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
FAIR VALUE OF FINANCIAL INSTRUMENTS	(P) 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 Notes at December 31, 2014 is as follows:
		Fair Value
		(dollars in thousands)
	Series 2005A Tranche B	$	58,528
	Series 2005A Tranche C		60,304
	Series 2007A Tranche B		8,440
	Series 2007A Tranche C		25,764
	Series 2007A Tranche D		39,895
	The estimated fair value of our long-term debt was 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, accounts and notes receivable, accounts payable and accrued liabilities approximate their fair values at December 31, 2014 due to the short-term maturities of these assets and liabilities. The fair value of our Amended Credit Facility also approximates its carrying value at December 31, 2014.

BASIS_OF_PRESENTATION_Policies

BASIS OF PRESENTATION (Policies)	9 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers.” ASU 2014-09 supersedes the revenue recognition requirements in “Revenue Recognition (Topic 605),” and requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. The standard will be effective for us in the first quarter of fiscal 2018, with early adoption not permitted. There are two transition methods available under the new standard, either cumulative effect or retrospective. We are currently evaluating the impact of this ASU and have not yet selected a transition method.

ACQUISITION_Tables

ACQUISITION (Tables)	9 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Components of Purchase Price Allocation	The following table summarizes the provisional allocation of the estimated Purchase Price to assets acquired and liabilities assumed as of the acquisition date:
	Purchase price allocation at acquisition date (in thousands)		As of
			14-Nov-14
	Cash and cash equivalents		$                219
	Accounts Receivable		14,640
	Inventories		9,668
	Prepaid and Other Assets		753
	Property and Equipment		203,637
	Intangible Assets		48,200
	Indemnity under Sales Agreement		14,813
	Other Assets		1,619
	Accounts Payable		(4,206)
	Accrued Liabilities		(2,072)
	Obligations under Long-term Sales Agreements		(30,100)
	Deferred Taxes		(20,000)
	Total Net Assets		237,171
	Goodwill		-
	Total Estimated Purchase Price		$         237,171
Summary of Preliminary Fair Value Estimates of Identifiable Intangible Assets and Weighted-Average Useful Lives	The following table is a summary of the preliminary fair value estimates of the identifiable intangible assets (in thousands) and their weighted-average useful lives:
		Weighted Average Life		Estimated Fair Value
	Customer Relationships	4		48,000
	Permits	40		200
	Total Intangible Assets			$  48,200
Net Sales and Operating Income of CRS Proppants	The following table presents the net sales and operating income of CRS Proppants that have been included in our consolidated statement of earnings from November 14, 2014 through the end of the quarter:
						Three Months Ended
						31-Dec-14
						(dollars in thousands)
	Revenues					$  9,452
	Operating Income					$     223
Unaudited Pro Forma Results
			For the Three Months Ended December 31,			For the Nine Months Ended December 31,
			2014		2013	2014	2013
			(dollars in thousands)			(dollars in thousands)
	Revenues		$    303,043		$     245,836	$    900,975	$     753,253
	Net Income		$      53,142		$       26,326	$    145,010	$       88,505
	Earnings per share – basis		$          1.07		$           0.53	$          2.92	$          1.80
	Earnings per share - diluted		$          1.05		$           0.52	$          2.88	$          1.77

STOCKHOLDERS_EQUITY_Tables

STOCKHOLDERS' EQUITY (Tables)	9 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Summary of Changes in Stockholders' Equity	A summary of changes in stockholders’ equity follows:
		For the Nine Months
		Ended December 31, 2014
		(dollars in thousands)
	Common Stock –
	Balance at Beginning of Period	$	501
	Stock Option Exercises		2
			503
	Balance at End of Period
	Capital in Excess of Par Value –
	Balance at Beginning of Period		253,524
	Stock Compensation Expense		13,299
	Shares Redeemed to Settle Employee Taxes		(1,356	)
	Stock Option Exercises		4,269
			269,736
	Balance at End of Period
	Retained Earnings –
	Balance at Beginning of Period		582,957
	Dividends Declared to Stockholders		(15,068	)
	Net Earnings		140,059
			707,948
	Balance at End of Period
	Accumulated Other Comprehensive Loss -
	Balance at Beginning of Period		(5,483	)
	Change in Funded Status of Pension Plan, net of tax		318
	Balance at End of Period		(5,165	)
		$	973,022
	Total Stockholders’ Equity

INVENTORIES_Tables

INVENTORIES (Tables)	9 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Inventories Stated at Lower of Average Cost or Market	Inventories are stated at the lower of average cost (including applicable material, labor, depreciation, and plant overhead) or market, and consist of the following:
		As of
		December 31,		March 31,
		2014		2014
		(dollars in thousands)
	Raw Materials and Material-in-Progress	$	100,377	$	82,319
	Finished Cement		16,546		19,173
	Gypsum Wallboard		6,108		7,144
	Frac Sand		3,497		275
	Aggregates		10,821		11,815
	Paperboard		3,996		4,102
	Repair Parts and Supplies		60,103		56,119
	Fuel and Coal		5,595		6,149
		$	207,043	$	187,096

ACCRUED_EXPENSES_Tables

ACCRUED EXPENSES (Tables)	9 Months Ended
	Dec. 31, 2014
Payables And Accruals [Abstract]
Schedule of Accrued Expenses	Accrued expenses consist of the following:
		As of
		December 31,		March 31,
		2014		2014
		(dollars in thousands)
	Payroll and Incentive Compensation	$	20,324	$	12,855
	Benefits		10,185		10,158
	Interest		1,874		4,813
	Property Taxes		1,538		2,801
	Power and Fuel		2,179		2,132
	Sales and Use Tax		694		658
	Legal		847		1,831
	Acquisition and Litigation		300		-
	Other		7,328		6,272
		$	45,269	$	41,520

SHAREBASED_EMPLOYEE_COMPENSATI1

SHARE-BASED EMPLOYEE COMPENSATION (Tables)	9 Months Ended
	Dec. 31, 2014
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 2015 are as follows:
		Fiscal 2015
	Dividend Yield		2.00%
	Expected Volatility		44.80%
	Risk Free Interest Rate		1.80%
	Expected Life		6.0 years
Stock Option Activity	The following table represents stock option activity for the nine month period ended December 31, 2014:
		Number			Weighted-
		of			Average
		Shares			Exercise Price
	Outstanding Options at Beginning of Period		2,788,999		$	41.83
	Granted		297,151		$	86.41
	Exercised		(149,585	)	$	32.43
	Cancelled		(1,269,500	)	$	47.43
	Outstanding Options at End of Period		1,667,065		$	46.35
	Options Exercisable at End of Period		1,035,166		$	34.45
	Weighted-Average Fair Value of Options Granted during the Period	$	32.31
Stock Options Outstanding	The following table summarizes information about stock options outstanding at December 31, 2014:
		Outstanding Options							Exercisable Options
	Range of Exercise Prices	Number of			Weighted -		Weighted -		Number of		Weighted -
		Shares			Average		Average		Shares		Average
		Outstanding			Remaining		Exercise		Outstanding		Exercise
					Contractual		Price				Price
					Life
	$23.17 – $ 30.74		593,710			4.45	$	26.5		590,710	$	26.48
	$33.08 – $ 40.78		487,968			7.16	$	33.95		308,352	$	34
	$53.22 – $ 74.10		283,236			8.07	$	66.58		117,589	$	66.57
	$79.90 – $ 93.56		302,151			9.56	$	86.42		18,515	$	91.95
			1,667,065			6.78	$	46.35		1,035,166	$	34.45

COMPUTATION_OF_EARNINGS_PER_SH1

COMPUTATION OF EARNINGS PER SHARE (Tables)	9 Months Ended
	Dec. 31, 2014
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						For the Nine Months
		Ended December 31,						Ended December 31,
		2014			2013			2014			2013
	Weighted-Average Shares of Common Stock Outstanding		49,655,405			49,294,010			49,583,210			49,091,476
	Common Equivalent Shares:
	Assumed Exercise of Outstanding Dilutive Options		1,349,997			1,559,885			1,418,957			1,648,483
	Less: Shares Repurchased from Assumed Proceeds of Assumed Exercised Options		(893,874	)		(1,011,617	)		(920,113	)		(1,095,651	)
	Restricted Shares		299,619			320,684			293,565			303,870
	Weighted-Average Common and Common Equivalent Shares Outstanding		50,411,147			50,162,962			50,375,619			49,948,178
	Shares Excluded Due to Anti-dilution Effects		279,651			216,914			206,702			124,970

PENSION_AND_EMPLOYEE_BENEFIT_P1

PENSION AND EMPLOYEE BENEFIT PLANS (Tables)	9 Months Ended
	Dec. 31, 2014
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						For the Nine Months ended
		December 31,						December 31,
		2014			2013			2014			2013
			(dollars in thousands)						(dollars in thousands)
	Service Cost – Benefits Earned During the Period	$	224		$	360		$	696		$	753
	Interest Cost of Benefit Obligations		324			306			954			917
	Expected Return on Plan Assets		(426	)		(410	)		(1,254	)		(1,096	)
	Recognized Net Actuarial Loss		150			215			460			707
	Amortization of Prior-Service Cost		3			1			9			9
	Net Periodic Pension Cost	$	275		$	472		$	865		$	1,290

LONGTERM_DEBT_Tables

LONG-TERM DEBT (Tables)	9 Months Ended
	Dec. 31, 2014
Debt Instrument [Line Items]
Long-Term Debt	Long-term debt consists of the following:
		As of
		December 31,			March 31,
		2014			2014
		(dollars in thousands)
	Credit Facility	$	335,000		$	189,000
	Senior Notes		182,759			192,259
	Total Debt		517,759			381,259
	Less: Current Portion of Long-term Debt		(57,045	)		(9,500	)
	Total Debt	$	460,714		$	371,759
2005 Note Purchase Agreement [Member]
Debt Instrument [Line Items]
Amount Outstanding of Tranches	Following these repurchases and maturities, the amounts outstanding for each of the remaining tranches are as follows:
		Principal			Maturity Date			Interest Rate
	Tranche B	$	57.0 million			November 15, 2015			5.38%
	Tranche C	$	57.2 million			November 15, 2017			5.48%
2007 Note Purchase Agreement [Member]
Debt Instrument [Line Items]
Amount Outstanding of Tranches	Following the repurchase, the amounts outstanding for each of the four tranches are as follows:
		Principal			Maturity Date			Interest Rate
	Tranche B	$	8.0 million			October 2, 2016			6.27%
	Tranche C	$	24.0 million			October 2, 2017			6.36%
	Tranche D	$	36.5 million			October 2, 2019			6.48%

SEGMENT_INFORMATION_Tables

SEGMENT INFORMATION (Tables)	9 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Financial Information Related to Operations by Segment	The following table sets forth certain financial information relating to our operations by segment:
		For the Three Months						For the Nine Months
		Ended December 31,						Ended December 31,
		2014			2013			2014			2013
		(dollars in thousands)						(dollars in thousands)
	Revenues -
	Cement	$	124,048		$	105,578		$	397,845		$	356,482
	Gypsum Wallboard		118,573			104,158			342,905			299,099
	Paperboard		39,936			33,696			112,994			100,501
	Oil and Gas Proppants		31,731			3,960			53,325			6,152
	Concrete and Aggregates		27,116			24,376			85,239			77,487
	Sub-total		341,404			271,768			992,308			839,721
	Less: Intersegment Revenues		(16,968	)		(16,766	)		(51,096	)		(49,247	)
	Net Revenues, including Joint Venture		324,436			255,002			941,212			790,474
	Less: Joint Venture		(32,907	)		(26,190	)		(98,624	)		(81,972	)
	Net Revenues	$	291,529		$	228,812		$	842,588		$	708,502
		For the Three Months						For the Nine Months
		Ended December 31,						Ended December 31,
		2014			2013			2014			2013
		(dollars in thousands)						(dollars in thousands)
	Intersegment Revenues -
	Cement	$	2,489		$	2,556		$	7,760		$	7,503
	Paperboard		14,305			13,993			42,645			40,855
	Concrete and Aggregates		174			217			691			889
		$	16,968		$	16,766		$	51,096		$	49,247
	Cement Sales Volume (in thousands of tons) -
	Wholly –owned Operations		935			876			3,135			3,037
	Joint Venture		270			239			837			753
			1,205			1,115			3,972			3,790
		For the Three Months						For the Nine Months
		Ended December 31,						Ended December 31,
		2014			2013			2014			2013
		(dollars in thousands)						(dollars in thousands)
	Operating Earnings -
	Cement	$	37,578		$	26,011		$	96,535		$	77,451
	Gypsum Wallboard		40,013			30,730			114,443			90,234
	Paperboard		9,102			6,661			24,633			19,277
	Oil and Gas Proppants		3,241			(2,162	)		3,315			(3,968	)
	Concrete and Aggregates		1,638			(1,536	)		5,959			418
	Other, net		488			400			2,050			1,300
	Sub-total		92,060			60,104			246,935			184,712
	Corporate General and Administrative		(9,371	)		(6,796	)		(23,827	)		(18,450	)
	Acquisition and Litigation Expense		(722	)		-			(2,825	)		-
	Earnings Before Interest and Income Taxes		81,967			53,308			220,283			166,262
	Interest Expense, net		(4,101	)		(4,475	)		(12,054	)		(14,225	)
	Earnings Before Income Taxes	$	77,866		$	48,833		$	208,229		$	152,037
	Cement Operating Earnings -
	Wholly–owned Operations	$	25,155		$	16,155		$	62,261		$	49,970
	Joint Venture		12,423			9,856			34,274			27,481
		$	37,578		$	26,011		$	96,535		$	77,451
	Capital Expenditures -
	Cement	$	3,890		$	2,657		$	16,886		$	8,493
	Gypsum Wallboard		1,154			1,284			4,947			2,983
	Paperboard		303			902			1,452			2,803
	Oil and Gas Proppants		18,421			5,533			32,023			26,549
	Concrete and Aggregates		1,128			1,135			9,477			2,266
	Other		24			114			174			114
		$	24,920		$	11,625		$	64,959		$	43,208
	Depreciation, Depletion and Amortization -
	Cement	$	8,089		$	8,036		$	23,959		$	23,684
	Gypsum Wallboard		4,967			5,239			15,096			15,783
	Paperboard		2,069			2,205			6,196			6,558
	Oil and Gas Proppants		2,673			475			3,926			1,160
	Concrete and Aggregates		1,465			1,300			4,058			4,001
Other, net		425			436			1,317			1,129
	$	19,688		$	17,691		$	54,552		$	52,315
	As of
	December 31,			March 31,
	2014			2014
	(dollars in thousands)
Identifiable Assets -
Cement	$	759,143		$	762,578
Gypsum Wallboard		408,097			412,566
Paperboard		123,131			125,045
Oil and Gas Proppants		448,155			71,366
Concrete and Aggregates		95,303			108,197
Corporate and Other		24,222			31,777
	$	1,858,051		$	1,511,529
Segment Breakdown of Goodwill	The segment breakdown of goodwill is as follows:
		As of
		December 31,			March 31,
		2014			2014
		(dollars in thousands)
	Cement	$	8,359		$	8,359
	Gypsum Wallboard		116,618			116,618
	Paperboard		7,538			7,538
		$	132,515		$	132,515
Summarized Financial Information for Joint Venture Unconsolidated	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						For the Nine Months
		Ended December 31,						Ended December 31,
		2014			2013			2014			2013
		(dollars in thousands)						(dollars in thousands)
	Revenues	$	65,815		$	52,380		$	197,249		$	163,944
	Gross Margin	$	26,445		$	20,513		$	72,282		$	57,848
	Earnings Before Income Taxes	$	24,846		$	19,712		$	68,548		$	54,962
		As of
		December 31,			March 31,
		2014			2014
		(dollars in thousands)
	Current Assets	$	68,161		$	59,029
	Non-Current Assets	$	43,281		$	42,826
	Current Liabilities	$	20,961		$	17,901

INTEREST_EXPENSE_Tables

INTEREST EXPENSE (Tables)	9 Months Ended
	Dec. 31, 2014
Banking And Thrift Interest [Abstract]
Interest Expense, Net	The following components are included in interest expense, net:
		For the Three Months						For the Nine Months
		Ended December 31,						Ended December 31,
		2014			2013			2014			2013
		(dollars in thousands)						(dollars in thousands)
	Interest (Income)	$	(2	)	$	(1	)	$	(5	)	$	(3	)
	Interest Expense		3,730			4,102			10,901			13,071
	Interest Expense – Income Taxes		174			155			522			481
	Other Expenses		199			219			636			676
	Interest Expense, net	$	4,101		$	4,475		$	12,054		$	14,225

FAIR_VALUE_OF_FINANCIAL_INSTRU1

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	9 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value of Senior Notes	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 Notes at December 31, 2014 is as follows:
		Fair Value
		(dollars in thousands)
	Series 2005A Tranche B	$	58,528
	Series 2005A Tranche C		60,304
	Series 2007A Tranche B		8,440
	Series 2007A Tranche C		25,764
	Series 2007A Tranche D		39,895

Basis_of_Presentation_Addition

Basis of Presentation - Additional Information (Detail) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Basis Of Presentation [Line Items]
Business acquisition cost of acquired transaction costs	$0.70
IRS [Member]
Basis Of Presentation [Line Items]
Legal fees	$2.80

Acquisition_Additional_Informa

Acquisition - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	9 Months Ended
	Nov. 14, 2014	Dec. 31, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Business acquisition purchase price	$237,200,000
In-process capital expenditures	8,900,000
Inventory acquired at fair value	9,668,000
Direct acquisition cost		400,000	1,100,000
CRS Proppants [Member] | Operating Income
Business Acquisition [Line Items]
Depreciation and amortization		1,900,000
Inventory acquired at fair value		$700,000	$700,000

Components_of_Purchase_Price_A

Components of Purchase Price Allocation (Detail) (USD $)	Dec. 31, 2014	Nov. 14, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Business Combinations [Abstract]
Cash and cash equivalents		$219
Accounts Receivable		14,640
Inventories		9,668
Prepaid and Other Assets		753
Property and Equipment		203,637
Intangible Assets	48,200	48,200
Indemnity under Sales Agreement		14,813
Other Assets		1,619
Accounts Payable		-4,206
Accrued Liabilities		-2,072
Obligations under Long-term Sales Agreements		-30,100
Deferred Taxes		-20,000
Total Net Assets		237,171
Goodwill	132,515		132,515
Total Estimated Purchase Price		$237,171

Summary_of_Preliminary_Fair_Va

Summary of Preliminary Fair Value Estimates of Identifiable Intangible Assets and Weighted-Average Useful Lives (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Nov. 14, 2014
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Fair Value	$48,200	$48,200
Customer Relationships [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Life	4 years
Estimated Fair Value	48,000
Permits [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Life	40 years
Estimated Fair Value	$200

Net_Sales_and_Operating_Income

Net Sales and Operating Income of CRS Proppants (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]
Revenues	$303,043	$245,836	$900,975	$753,253
Operating Income	92,060	60,104	246,935	184,712
CRS Proppants [Member]
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]
Revenues	9,452
Operating Income	$223

Unaudited_Pro_Forma_Results_De

Unaudited Pro Forma Results (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Business Combinations [Abstract]
Revenues	$303,043	$245,836	$900,975	$753,253
Net Income	$53,142	$26,326	$145,010	$88,505
Earnings per share – basis	$1.07	$0.53	$2.92	$1.80
Earnings per share - diluted	$1.05	$0.52	$2.88	$1.77

Recovered_Sheet1

Cash Flow Information - Supplemental - Additional Information (Detail) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]
Cash payments made for interest	$13.60	$16.10
Net payments made for federal and state income taxes	60	32.6
Non-cash investing activities, purchase of capital equipment	4.1
Accrued value of capital equipment	$4.10

Accounts_and_Notes_Receivable_

Accounts and Notes Receivable - Additional Information (Detail) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2014
Accounts Notes And Loans Receivable [Line Items]
Allowance for doubtful accounts	6.9	$5.80
Notes receivable total	3.4
Notes receivable, current	0.5
Notes receivable interest rate	3.50%
Minimum [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes receivable, maturity year	2014
Maximum [Member]
Accounts Notes And Loans Receivable [Line Items]
Notes receivable, maturity year	2017

Summary_of_Change_in_Stockhold

Summary of Change in Stockholder's Equity (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Stockholders Equity Note [Line Items]
Balance at Beginning of Period			$831,499
Net Earnings	52,030	31,621	140,059	101,625
Balance at End of Period	973,022		973,022
Common Stock [Member]
Stockholders Equity Note [Line Items]
Balance at Beginning of Period			501
Stock Option Exercises			2
Balance at End of Period	503		503
Capital in Excess of Par Value [Member]
Stockholders Equity Note [Line Items]
Balance at Beginning of Period			253,524
Stock Compensation Expense			13,299
Shares Redeemed to Settle Employee Taxes			-1,356
Stock Option Exercises			4,269
Balance at End of Period	269,736		269,736
Retained Earnings [Member]
Stockholders Equity Note [Line Items]
Balance at Beginning of Period			582,957
Dividends Declared to Stockholders			-15,068
Net Earnings			140,059
Balance at End of Period	707,948		707,948
Accumulated Other Comprehensive Losses [Member]
Stockholders Equity Note [Line Items]
Balance at Beginning of Period			-5,483
Change in Funded Status of Pension Plan, net of tax			318
Balance at End of Period	($5,165)		($5,165)

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Dec. 31, 2014	Dec. 31, 2014
Equity [Abstract]
Number of additional shares authorized to be purchased	717,300	717,300
Open market share repurchases	$0	$0

Inventories_Stated_at_Lower_of

Inventories Stated at Lower of Average Cost or Market (Detail) (USD $)	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Inventory [Line Items]
Inventories	$207,043	$187,096
Raw Materials and Material-in-Progress [Member]
Inventory [Line Items]
Inventories	100,377	82,319
Finished Cement [Member]
Inventory [Line Items]
Inventories	16,546	19,173
Gypsum Wallboard [Member]
Inventory [Line Items]
Inventories	6,108	7,144
Frac Sand [Member]
Inventory [Line Items]
Inventories	3,497	275
Aggregates [Member]
Inventory [Line Items]
Inventories	10,821	11,815
Paperboard [Member]
Inventory [Line Items]
Inventories	3,996	4,102
Repair Parts and Supplies [Member]
Inventory [Line Items]
Inventories	60,103	56,119
Fuel and Coal [Member]
Inventory [Line Items]
Inventories	$5,595	$6,149

Schedule_of_Accrued_Expenses_D

Schedule of Accrued Expenses (Detail) (USD $)	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Accounts Payable And Accrued Liabilities Current [Abstract]
Payroll and Incentive Compensation	$20,324	$12,855
Benefits	10,185	10,158
Interest	1,874	4,813
Property Taxes	1,538	2,801
Power and Fuel	2,179	2,132
Sales and Use Tax	694	658
Legal	847	1,831
Acquisition and Litigation	300
Other	7,328	6,272
Accrued expenses, total	$45,269	$41,520

Share_Based_Employee_Compensat

Share Based Employee Compensation - Additional Information (Detail) (USD $)	3 Months Ended			9 Months Ended		1 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Aug. 31, 2014	Aug. 07, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant	4,873,975			4,873,975			3,000,000
Number of shares, granted				297,151
Stock option expense	$1.40		$1.30	$4.80	$4
Shares expired		1,270,000
Aggregate intrinsic value for outstanding options	49.5			49.5
Aggregate intrinsic value of exercisable options	43.1			43.1
Total intrinsic value of options exercised				9.5
Restricted stock or unit expense	1.7		1.3	5	3.4
Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant							1,500,000
Unrecognized compensation cost, stock options	13			13
Weighted-average period of recognition of unrecognized compensation cost				3 years 4 months 24 days
Fiscal 2015 Employee Stock Option Grant [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, granted				193,636
Share-based compensation vesting period				3 years
Share-based compensation award expiration term				10 years
Percentage of average return on invested capital				15.00%
Period of average return on invested capital exceeded target				10 years
Fiscal 2015 Board of Directors Grant [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, granted						18,515
Share-based compensation award expiration term						10 years
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of average return on invested capital				15.00%
Share-based compensation vesting date				31-Mar-15
Weighted-average period of recognition of unrecognized compensation cost				2 years 8 months 12 days
Number of shares granted				80,416		7,457
Unrecognized compensation cost	$18.70			$18.70
Restricted Stock [Member] | Board of Directors [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation vesting period				5 years		5 years
Restricted Stock [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation vesting date				31-Mar-16
Restricted Stock [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation vesting date				31-Mar-16

WeightedAverage_Assumptions_Us

Weighted-Average Assumptions Used to Value Option Awards (Detail) (Fiscal 2015 Employee Stock Option and Board of Directors Grants [Member])	9 Months Ended
	Dec. 31, 2014
Fiscal 2015 Employee Stock Option and Board of Directors Grants [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend Yield	2.00%
Expected Volatility	44.80%
Risk Free Interest Rate	1.80%
Expected Life	6 years

Stock_Option_Activity_Detail

Stock Option Activity (Detail) (USD $)	9 Months Ended
	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding Options at Beginning of Period	2,788,999
Number of shares, granted	297,151
Number of Shares, Exercised	-149,585
Number of Shares, Cancelled	-1,269,500
Number of Shares, Outstanding Options at End of Period	1,667,065
Number of Shares, Options Exercisable at End of Period	1,035,166
Weighted-Average Exercise Price, Weighted-Average Fair Value of Options Granted during the Period	$32.31
Weighted-Average Exercise Price, Outstanding Options at Beginning of Period	$41.83
Weighted-Average Exercise Price, Granted	$86.41
Weighted-Average Exercise Price, Exercised	$32.43
Weighted-Average Exercise Price, Cancelled	$47.43
Weighted-Average Exercise Price, Outstanding Options at End of Period	$46.35
Weighted-Average Exercise Price, Options Exercisable at End of Period	$34.45

Stock_Options_Outstanding_Deta

Stock Options Outstanding (Detail) (USD $)	9 Months Ended
	Dec. 31, 2014
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding, Number of Shares Outstanding	1,667,065
Options Outstanding, Weighted-Average Remaining Contractual Life	6 years 9 months 11 days
Options Outstanding, Weighted-Average Exercise Price	$46.35
Options Exercisable, Number of Shares Outstanding	1,035,166
Options Exercisable, Weighted-Average Exercise Price	$34.45
$23.17 - $30.74 [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	$30.74
Options Outstanding, Number of Shares Outstanding	593,710
Options Outstanding, Weighted-Average Remaining Contractual Life	4 years 5 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$26.50
Options Exercisable, Number of Shares Outstanding	590,710
Options Exercisable, Weighted-Average Exercise Price	$26.48
$33.08 - $40.78 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	$33.08
Range of Exercise Prices, Upper Range	$40.78
Options Outstanding, Number of Shares Outstanding	487,968
Options Outstanding, Weighted-Average Remaining Contractual Life	7 years 1 month 28 days
Options Outstanding, Weighted-Average Exercise Price	$33.95
Options Exercisable, Number of Shares Outstanding	308,352
Options Exercisable, Weighted-Average Exercise Price	$34
$53.22 – $ 74.10 [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	$74.10
Options Outstanding, Number of Shares Outstanding	283,236
Options Outstanding, Weighted-Average Remaining Contractual Life	8 years 26 days
Options Outstanding, Weighted-Average Exercise Price	$66.58
Options Exercisable, Number of Shares Outstanding	117,589
Options Exercisable, Weighted-Average Exercise Price	$66.57
$79.90 - $ 93.56 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	$79.90
Range of Exercise Prices, Upper Range	$93.56
Options Outstanding, Number of Shares Outstanding	302,151
Options Outstanding, Weighted-Average Remaining Contractual Life	9 years 6 months 22 days
Options Outstanding, Weighted-Average Exercise Price	$86.42
Options Exercisable, Number of Shares Outstanding	18,515
Options Exercisable, Weighted-Average Exercise Price	$91.95

Calculation_of_Basic_and_Dilut

Calculation of Basic and Diluted Common Shares Outstanding (Detail)	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Earning Per Share [Abstract]
Weighted-Average Shares of Common Stock Outstanding	49,655,405	49,294,010	49,583,210	49,091,476
Assumed Exercise of Outstanding Dilutive Options	1,349,997	1,559,885	1,418,957	1,648,483
Less: Shares Repurchased from Assumed Proceeds of Assumed Exercised Options	-893,874	-1,011,617	-920,113	-1,095,651
Restricted Shares	299,619	320,684	293,565	303,870
Weighted-Average Common and Common Equivalent Shares Outstanding	50,411,147	50,162,962	50,375,619	49,948,178
Shares Excluded Due to Anti-dilution Effects	279,651	216,914	206,702	124,970

Components_of_Net_Periodic_Cos

Components of Net Periodic Cost (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]
Service Cost – Benefits Earned During the Period	$224	$360	$696	$753
Interest Cost of Benefit Obligations	324	306	954	917
Expected Return on Plan Assets	-426	-410	-1,254	-1,096
Recognized Net Actuarial Loss	150	215	460	707
Amortization of Prior-Service Cost	3	1	9	9
Net Periodic Pension Cost	$275	$472	$865	$1,290

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Dec. 31, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Effective tax rate	33.00%	33.00%

LongTerm_Debt_Detail

Long-Term Debt (Detail) (USD $)	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Total Debt	$517,759	$381,259
Less Current Portion of Long-term Debt	-57,045	-9,500
Total Debt	460,714	371,759
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total Debt	335,000	189,000
Senior Notes [Member]
Debt Instrument [Line Items]
Total Debt	$182,759	$192,259

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Detail) (USD $)	9 Months Ended	94 Months Ended	1 Months Ended	78 Months Ended	1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Nov. 30, 2012	Mar. 31, 2013	Oct. 31, 2014	Nov. 15, 2005	Oct. 02, 2007
						Loan	Loan
Debt Instrument [Line Items]
Consolidated funded indebtedness ratio	3.5:1.0 or less and an interest coverage ratio
Interest coverage ratio	2.5
Borrowings outstanding under Credit Facility	$335	$335
Bank credit facility, borrowings available	155.8	155.8
Letter of credit facility	50	50
Letters of credit outstanding, amount	9.2	9.2
Senior notes, permitted minimum aggregate principal amount prepayment without penalty	10.00%
Percentage of face value to be paid if notes are prepaid	100.00%
Senior notes, calculation of make-whole amount, description	Discounting the remaining scheduled payments of interest and principal of the Senior Notes being prepaid at a discount rate equal to the sum of 50 basis points
Discount on senior notes principal and interest	0.50%
2005 Note Purchase Agreement [Member]
Debt Instrument [Line Items]
Senior notes, sale						200
Number of tranches						3
Senior notes, repurchased amount		81.1
Senior notes, payment terms	Interest for each tranche of Notes is payable semi-annually on the 15th day of May and the 15th day of November of each year until all principal is paid for the respective tranche.
2005 Note Purchase Agreement [Member] | Series 2005A Tranche A [Member]
Debt Instrument [Line Items]
Repayment of senior note			4.7
2007 Note Purchase Agreement [Member]
Debt Instrument [Line Items]
Senior notes, sale							200
Number of tranches							4
Senior notes, repurchased amount				122
Senior notes, payment terms	Interest for each tranche of Notes is payable semi-annually on the second day of April and the second day of October of each year until all principal is paid for the respective tranche.
2007 Note Purchase Agreement [Member] | Series 2007A Tranche A [Member]
Debt Instrument [Line Items]
Repayment of senior note					9.5
Letter of Credit [Member]
Debt Instrument [Line Items]
Bank credit facility, one-time fee	0.13%
Letters of credit outstanding, amount	9.2	9.2
Minimum [Member]
Debt Instrument [Line Items]
Unused line of credit commitment fee based on leverage ratio	0.10%
Maximum [Member]
Debt Instrument [Line Items]
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 | Minimum [Member]
Debt Instrument [Line Items]
Variable margin	0.00%
Federal Funds Effective Swap Rate | Maximum [Member]
Debt Instrument [Line Items]
Variable margin	1.25%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, principal balance	500	500
Credit facility, maturity date	31-Oct-19
Credit facility, interest rate description	At the option of the Company, outstanding principal amounts on the Amended Credit Facility bear interest at a variable rate equal to (i) LIBOR, plus an agreed margin (ranging from 100 to 225 basis points), which is to be established quarterly based upon 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 agreed margin (ranging from 0 to 125 basis points). Interest payments are payable, in the case of loans bearing interest at a rate based on the federal funds rate, quarterly, or in the case of loans bearing interest at a rate based on LIBOR, at the end of the LIBOR advance periods, which can be a period of 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 Amended Credit Facility ranging from 10 to 35 basis points depending upon the Leverage Ratio.
Revolving Credit Facility [Member] | Scenario, Previously Reported
Debt Instrument [Line Items]
Credit facility, principal balance	$400	$400
Credit facility, maturity date	15-Dec-15
Line of Credit | Federal Funds Effective Swap Rate | Maximum [Member]
Debt Instrument [Line Items]
Variable margin	0.50%

Amount_Outstanding_of_Tranches

Amount Outstanding of Tranches - Two Thousand Five Note Purchase Agreement (Detail) (2005 Note Purchase Agreement [Member], USD $)	9 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Series 2005A Tranche B [Member]
Debt Instrument [Line Items]
Principal	$57
Maturity Date	15-Nov-15
Interest Rate	5.38%
Series 2005A Tranche C [Member]
Debt Instrument [Line Items]
Principal	$57.20
Maturity Date	15-Nov-17
Interest Rate	5.48%

Amount_Outstanding_of_Tranches1

Amount Outstanding of Tranches - Two Thousand Seven Note Purchase Agreement (Detail) (2007 Note Purchase Agreement [Member], USD $)	9 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Series 2007A Tranche B [Member]
Debt Instrument [Line Items]
Principal	$8
Maturity Date	2-Oct-16
Interest Rate	6.27%
Series 2007A Tranche C [Member]
Debt Instrument [Line Items]
Principal	24
Maturity Date	2-Oct-17
Interest Rate	6.36%
Series 2007A Tranche D [Member]
Debt Instrument [Line Items]
Principal	$36.50
Maturity Date	2-Oct-19
Interest Rate	6.48%

Segment_Information_Additional

Segment Information - Additional Information (Detail) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
	Plant
	Facility
	Segment
	Location
	Terminal
Segment Reporting Information [Line Items]
Number of operating business segments	5
Cement plant locations	6
Cement distribution terminals	16
Gypsum wallboard plants	5
Readymix concrete batch plant	17
Aggregates processing plant	4
Number of frac sand mines locations	2
Number of frac sand processing facilities	2
Number of frac sand transload locations	5
Proportionate consolidation of share of Joint Venture's revenues and operating earnings	50.00%
Cement [Member]
Segment Reporting Information [Line Items]
Number of Joint Venture	1
Gypsum Wallboard [Member]
Segment Reporting Information [Line Items]
Carrying value of plant	2.8
Carrying value of equipment	0.7

Financial_Information_Related_

Financial Information Related to Operations by Segment (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2014
Segment Reporting Information [Line Items]
Net Revenues	$291,529	$228,812	$842,588	$708,502
Operating Earnings	92,060	60,104	246,935	184,712
Corporate General and Administrative	-9,371	-6,796	-23,827	-18,450
Acquisition and Litigation Expense	-722		-2,825
Earnings Before Interest and Income Taxes	81,967	53,308	220,283	166,262
Interest Expense, Net	-4,101	-4,475	-12,054	-14,225
Earnings Before Income Taxes	77,866	48,833	208,229	152,037
Capital Expenditures	24,920	11,625	64,959	43,208
Depreciation, Depletion and Amortization	19,688	17,691	54,552	52,315
Identifiable Assets	1,858,051		1,858,051		1,511,529
Sales Revenue, Net [Member]
Segment Reporting Information [Line Items]
Net Revenues	324,436	255,002	941,212	790,474
Joint Venture [Member]
Segment Reporting Information [Line Items]
Net Revenues	-32,907	-26,190	-98,624	-81,972
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Revenues	341,404	271,768	992,308	839,721
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net Revenues	16,968	16,766	51,096	49,247
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Operating Earnings	488	400	2,050	1,300
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	24	114	174	114
Depreciation, Depletion and Amortization	425	436	1,317	1,129
Cement [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume	1,205	1,115	3,972	3,790
Identifiable Assets	759,143		759,143		762,578
Cement [Member] | Joint Venture [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume	270	239	837	753
Cement [Member] | Wholly-Owned [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume	935	876	3,135	3,037
Cement [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Revenues	124,048	105,578	397,845	356,482
Operating Earnings	37,578	26,011	96,535	77,451
Capital Expenditures	3,890	2,657	16,886	8,493
Depreciation, Depletion and Amortization	8,089	8,036	23,959	23,684
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]
Segment Reporting Information [Line Items]
Operating Earnings	12,423	9,856	34,274	27,481
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]
Segment Reporting Information [Line Items]
Operating Earnings	25,155	16,155	62,261	49,970
Cement [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net Revenues	2,489	2,556	7,760	7,503
Gypsum Wallboard [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	408,097		408,097		412,566
Gypsum Wallboard [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Revenues	118,573	104,158	342,905	299,099
Operating Earnings	40,013	30,730	114,443	90,234
Capital Expenditures	1,154	1,284	4,947	2,983
Depreciation, Depletion and Amortization	4,967	5,239	15,096	15,783
Paperboard [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	123,131		123,131		125,045
Paperboard [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Revenues	39,936	33,696	112,994	100,501
Operating Earnings	9,102	6,661	24,633	19,277
Capital Expenditures	303	902	1,452	2,803
Depreciation, Depletion and Amortization	2,069	2,205	6,196	6,558
Paperboard [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net Revenues	14,305	13,993	42,645	40,855
Oil And Gas Proppants [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	448,155		448,155		71,366
Oil And Gas Proppants [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Revenues	31,731	3,960	53,325	6,152
Operating Earnings	3,241	-2,162	3,315	-3,968
Capital Expenditures	18,421	5,533	32,023	26,549
Depreciation, Depletion and Amortization	2,673	475	3,926	1,160
Concrete and Aggregates [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	95,303		95,303		108,197
Concrete and Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Revenues	27,116	24,376	85,239	77,487
Operating Earnings	1,638	-1,536	5,959	418
Capital Expenditures	1,128	1,135	9,477	2,266
Depreciation, Depletion and Amortization	1,465	1,300	4,058	4,001
Concrete and Aggregates [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net Revenues	174	217	691	889
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	$24,222		$24,222		$31,777

Segment_Breakdown_of_Goodwill_

Segment Breakdown of Goodwill (Detail) (USD $)	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Segment Reporting Information [Line Items]
Goodwill	$132,515	$132,515
Operating Segments [Member] | Cement [Member]
Segment Reporting Information [Line Items]
Goodwill	8,359	8,359
Operating Segments [Member] | Gypsum Wallboard [Member]
Segment Reporting Information [Line Items]
Goodwill	116,618	116,618
Operating Segments [Member] | Paperboard [Member]
Segment Reporting Information [Line Items]
Goodwill	$7,538	$7,538

Summarized_Financial_Informati

Summarized Financial Information for Joint Venture Unconsolidated (Detail) (Joint Venture [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2014
Joint Venture [Member]
Segment Reporting Information [Line Items]
Revenues	$65,815	$52,380	$197,249	$163,944
Gross Margin	26,445	20,513	72,282	57,848
Earnings Before Income Taxes	24,846	19,712	68,548	54,962
Current Assets	68,161		68,161		59,029
Non-Current Assets	43,281		43,281		42,826
Current Liabilities	$20,961		$20,961		$17,901

Interest_Expense_Net_Detail

Interest Expense, Net (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Interest Income (Expense), Net [Abstract]
Interest (Income)	($2)	($1)	($5)	($3)
Interest Expense	3,730	4,102	10,901	13,071
Interest Expense – Income Taxes	174	155	522	481
Other Expenses	199	219	636	676
Interest Expense, net	$4,101	$4,475	$12,054	$14,225

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended
	4-May-11	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Product Liability Contingency [Line Items]
Letters of credit outstanding, amount		$9,200,000		$9,200,000
Outstanding guarantees		0		0
Contingently liable for performance, current		14,300,000		14,300,000
Federal income tax	97,900,000
Percentage of penalties and related interest assessed to date				40.00%
Unrecognized penalties and interest expense				5,800,000
Interest on income tax		174,000	155,000	522,000	481,000
Scenario Forecast [Member]
Product Liability Contingency [Line Items]
Interest on income tax				$3,400,000

Fair_Value_of_Senior_Notes_Det

Fair Value of Senior Notes (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Series 2005A Tranche B [Member]
Fair Value Of Financial Instruments [Line Items]
Fair Value of Senior Notes	$58,528
Series 2005A Tranche C [Member]
Fair Value Of Financial Instruments [Line Items]
Fair Value of Senior Notes	60,304
Series 2007A Tranche B [Member]
Fair Value Of Financial Instruments [Line Items]
Fair Value of Senior Notes	8,440
Series 2007A Tranche C [Member]
Fair Value Of Financial Instruments [Line Items]
Fair Value of Senior Notes	25,764
Series 2007A Tranche D [Member]
Fair Value Of Financial Instruments [Line Items]
Fair Value of Senior Notes	$39,895