Eagle Materials (EXP) 10-Q 7 Nov 13 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Sep. 30, 2013	Nov. 04, 2013
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Trading Symbol	'EXP	'
Entity Registrant Name	'EAGLE MATERIALS INC	'
Entity Central Index Key	'0000918646	'
Current Fiscal Year End Date	'--03-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	49,930,568

Consolidated_Statements_of_Ear

Consolidated Statements of Earnings (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]	'	'	'	'
Revenues	$252,646	$164,659	$479,690	$318,701
Cost of Goods Sold	193,167	132,170	373,607	263,315
Gross Profit	59,479	32,489	106,083	55,386
Equity in Earnings of Unconsolidated Joint Venture	9,747	8,750	17,625	15,218
Corporate General and Administrative	-6,060	-5,919	-11,654	-10,674
Acquisition and Litigation Expense	'	-5,713	'	-6,374
Other Income	317	66	900	-204
Interest Expense, Net	-4,795	-3,548	-9,750	-7,313
Earnings Before Income Taxes	58,688	26,125	103,204	46,039
Income Tax Expense	-18,785	-8,172	-33,200	-14,108
Net Earnings	$39,903	$17,953	$70,004	$31,931
EARNINGS PER SHARE:	'	'	'	'
Basic	$0.81	$0.40	$1.43	$0.71
Diluted	$0.80	$0.40	$1.40	$0.71
AVERAGE SHARES OUTSTANDING:	'	'	'	'
Basic	49,012,045	44,746,225	48,984,038	44,708,499
Diluted	49,860,100	45,353,778	49,835,382	45,219,224
CASH DIVIDENDS PER SHARE:	$0.10	$0.10	$0.20	$0.20

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Earnings (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Net Earnings	$39,903	$17,953	$70,004	$31,931
Change in Funded Status of Defined Benefit Plans:	'	'	'	'
Amortization of Net Actuarial Loss	238	178	476	356
Tax Expense	-83	-62	-166	-124
Comprehensive Earnings	$40,058	$18,069	$70,314	$32,163

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Current Assets -	'	'
Cash and Cash Equivalents	$10,628	$3,897
Accounts and Notes Receivable	119,748	87,543
Inventories	162,094	156,380
Income Tax Receivable	'	2,443
Prepaid and Other Assets	8,235	11,008
Total Current Assets	300,705	261,271
Property, Plant and Equipment -	1,636,244	1,599,992
Less: Accumulated Depreciation	-646,142	-614,268
Property, Plant and Equipment, net	990,102	985,724
Notes Receivable	3,488	3,893
Investment in Joint Venture	40,071	42,946
Goodwill and Intangible Assets	161,432	162,400
Other Assets	14,377	19,999
Total Assets	1,510,175	1,476,233
Current Liabilities -	'	'
Accounts Payable	50,878	58,880
Accrued Liabilities	40,785	41,349
Income Taxes Payable	10,028	'
Total Current Liabilities	101,691	100,229
Long-term Debt	455,259	489,259
Other Long-term Liabilities	53,334	51,547
Deferred Income Taxes	135,571	139,028
Total Liabilities	745,855	780,063
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 49,675,688 and 49,503,496 Shares, respectively	497	495
Capital in Excess of Par Value	231,836	224,053
Accumulated Other Comprehensive Losses	-6,732	-7,042
Retained Earnings	538,719	478,664
Total Stockholders' Equity	764,320	696,170
Liabilities and Stockholders' Equity, Total	$1,510,175	$1,476,233

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Mar. 31, 2013
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	'	'
Common Stock, Par Value	$0.01	$0.01
Common Stock, Authorized	100,000,000	100,000,000
Common Stock, Issued	49,675,688	49,503,496
Common Stock, Outstanding	49,675,688	49,503,496

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net Earnings	$70,004	$31,931
Adjustments to Reconcile Net Earnings to Net Cash Provided by Operating Activities -	'	'
Depreciation, Depletion and Amortization	34,624	25,444
Deferred Income Tax Provision	-3,594	-6,683
Stock Compensation Expense	4,816	4,139
Excess Tax Benefits from Share Based Payment Arrangements	-1,053	-149
Equity in Earnings of Unconsolidated Joint Venture	-17,625	-15,218
Distributions from Joint Venture	20,500	14,250
Changes in Operating Assets and Liabilities:	'	'
Accounts and Notes Receivable	-30,132	-17,749
Inventories	-7,712	14,602
Accounts Payable and Accrued Liabilities	-2,894	5,766
Other Assets	-1,203	-2,095
Income Taxes Payable	13,524	12,522
Net Cash Provided by Operating Activities	79,255	66,760
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Property, Plant and Equipment Additions	-31,583	-8,628
Net Cash Used in Investing Activities	-31,583	-8,628
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Decrease in Credit Facility	-34,000	-50,000
Dividends Paid to Stockholders	-9,910	-9,057
Proceeds from Stock Option Exercises	2,351	3,365
Shares Redeemed to Settle Employee Taxes on Stock Compensation	-435	-921
Excess Tax Benefits from Share Based Payment Arrangements	1,053	149
Net Cash Used in Financing Activities	-40,941	-56,464
NET INCREASE IN CASH AND CASH EQUIVALENTS	6,731	1,668
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	3,897	6,481
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$10,628	$8,149

BASIS_OF_PRESENTATION

BASIS OF PRESENTATION	6 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
BASIS OF PRESENTATION	'
	(A) BASIS OF PRESENTATION
	The accompanying unaudited consolidated financial statements as of and for the six month period ended September 30, 2013 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 24, 2013.
	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.
	Recent Accounting Pronouncements
	There are no recent accounting pronouncements that we expect will materially impact our financial statements during the current fiscal year.

Acquisition

Acquisition	6 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]	'
Acquisition	'
	(B) Acquisition
	On November 30, 2012, the Company completed the acquisition (the “Acquisition”) of certain assets of Lafarge North America Inc. (“Lafarge North America” or “the Sellers”). The Acquisition expanded the scope of our cement business in a geographic area that is complementary to, but does not overlap with, our existing cement business. The Acquisition also further positions the Company near energy growth markets where there is growing demand for our specialty oil well cement and other related products.
	The assets acquired by us in the Acquisition were used by the Sellers in connection with the business (the “Acquired Assets”) of producing, marketing and selling portland cement and concrete in Kansas, Missouri and Oklahoma, and include the following:
		•		two cement plants located in Sugar Creek, Missouri and Tulsa, Oklahoma;
		•		the related cement distribution terminals located in Sugar Creek and Springfield, Missouri; Omaha, Nebraska; Iola and Wichita, Kansas; and Oklahoma City, Oklahoma;
		•		two aggregates quarries near Sugar Creek, Missouri;
		•		eight ready-mix plants located in or near Kansas City, Missouri;
		•		certain fly ash operations conducted in the Kansas City, Missouri area; and
		•		certain related assets such as equipment, accounts receivable and inventory.
	In most cases, we acquired ownership of these assets from the Sellers. However, the cement plant located in Sugar Creek, Missouri was leased by the Sellers pursuant to a long-term lease containing a purchase option exercisable by payment of a nominal fee. This lease, including the purchase option, was transferred to us at the closing of the Acquisition. In addition, we assumed certain liabilities in the Acquisition, including accounts payable, contractual obligations, reclamation obligations and other liabilities related to the Acquired Assets.
	Purchase Price: The final purchase price (the “Purchase Price”) of the Acquisition was $450.7 million, which reflects a $2.7 million reduction from the preliminary purchase price to reflect actual working capital acquired at the closing. The reduction in purchase price was primarily related to adjustments to the final value of inventory and prepaid assets acquired. We funded the payment of the Purchase Price at closing and expenses incurred in connection with the Acquisition through a combination of borrowings under our bank credit facility and the proceeds from our issuance of common stock, which was completed on October 3, 2012.
	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. We engaged a third-party to perform a valuation to support our estimate of the fair value of certain assets acquired in the Acquisition. The working capital amounts paid at the closing were adjusted by approximately $2.7 million to reflect actual working capital acquired.
	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 we believe to be reasonable. However, actual results may differ from these estimates.
	Under the acquisition method of accounting, the total purchase price was allocated to the net tangible and intangible assets and assumed liabilities based on their estimated fair values at the acquisition date. Based on the fair value of tangible and intangible assets acquired and liabilities assumed the purchase price is allocated as follows:
	Purchase Price Allocation (in thousands)
	Cash and cash equivalents		$	—
	Accounts Receivable			23,432
	Inventories			20,361
	Prepaid and Other Assets			3,511
	Property and Equipment			407,260
	Intangible Assets			12,500
	Accounts Payable			(9,070	)
	Accrued Liabilities			(3,501	)
	Other Long-term Liabilities			(1,060	)
	Total Net Assets			453,433
	Goodwill			—
	Initial Purchase Price		$	453,433
	Final Working Capital Adjustment			(2,734	)
	Final Purchase Price		$	450,699
	Intangible Assets: The following table is a summary of the fair value estimates of the identifiable intangible assets (in thousands) and their weighted-average useful lives:
			Weighted			Fair Value
			Average Life
	Customer Relationships			15		$	4,760
	Sales Contracts			4			2,500
	Permits			40			5,240
	Total Intangible Assets					$	12,500
	Actual and pro forma impact of the Acquisition: The following table presents the net sales and operating income of the Acquired Assets that have been included in our consolidated statement of earnings from April 1, 2013 through September 30, 2013:
			Three Month Period			Six Month Period
			Ended September 30, 2013			Ended September 30, 2013
			(dollars in thousands)
	Net Sales		$	52,603		$	93,683
	Operating Income		$	12,288		$	18,713
	The unaudited pro forma results presented below include the effects of the Acquisition as if it had been consummated as of April 1, 2012. 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, depreciation from the fair value adjustments for property and equipment, and the impact on earnings per share of the issuance of common stock in connection with the Acquisition. To better reflect the combined operating results, material nonrecurring charges directly related to the Acquisition of $6.1 million have been excluded from pro forma net income for the three and six month periods ended September 30, 2012.
			Three Month Period			Six Month Period
			Ended September 30, 2012			Ended September 30, 2012
			(dollars in thousands)
	Revenues		$	222,665		$	431,124
	Net Income		$	22,286		$	37,193
	Earnings per share - basic		$	0.46		$	0.77
	Earnings per share - diluted		$	0.46		$	0.76
	Weighted Average Shares Outstanding:
	Basic			48,196,225			48,158,499
	Diluted			48,803,778			48,669,224
	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, 2012.

ACCOUNTS_AND_NOTES_RECEIVABLE

ACCOUNTS AND NOTES RECEIVABLE	6 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
ACCOUNTS AND NOTES RECEIVABLE	'
	(C) ACCOUNTS AND NOTES RECEIVABLE
	Accounts and notes receivable have been shown net of the allowance for doubtful accounts of $5.2 million and $5.1 million at September 30, 2013 and March 31, 2013, 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 $9.7 million at September 30, 2013, of which approximately $6.2 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 the prime rate plus 1.5%. 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	6 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
STOCKHOLDERS EQUITY	'
	(D) STOCKHOLDERS’ EQUITY
	A summary of changes in stockholders’ equity follows:
		For the Six Months
		Ended  September 30, 2013
		(dollars in thousands)
	Common Stock –
	Balance at Beginning of Period	$	495
	Stock Option Exercises		2
	Balance at End of Period		497
	Capital in Excess of Par Value –
	Balance at Beginning of Period		224,053
	Stock Compensation Expense		4,814
	Shares Redeemed to Settle Employee Taxes		(435	)
	Stock Option Exercises		3,404
	Balance at End of Period		231,836
	Retained Earnings –
	Balance at Beginning of Period		478,664
	Dividends Declared to Stockholders		(9,949	)
	Net Earnings		70,004
	Balance at End of Period		538,719
	Accumulated Other Comprehensive Loss -
	Balance at Beginning of Period		(7,042	)
	Change in Funded Status of Pension Plan, net of tax		310
	Balance at End of Period		(6,732	)
	Total Stockholders’ Equity	$	764,320
	There were no open market share repurchases during the three and six month periods ended September 30, 2013. As of September 30, 2013, we have authorization to purchase an additional 717,300 shares.

CASH_FLOW_INFORMATION_SUPPLEME

CASH FLOW INFORMATION - SUPPLEMENTAL	6 Months Ended
	Sep. 30, 2013
Supplemental Cash Flow Elements [Abstract]	'
CASH FLOW INFORMATION - SUPPLEMENTAL	'
	(E) CASH FLOW INFORMATION—SUPPLEMENTAL
	Cash payments made for interest were $9.0 million and $7.0 million for the six months ended September 30, 2013 and 2012, respectively. Net payments made for federal and state income taxes during the six months ended September 30, 2013 and 2012, were $20.8 million and $7.3 million, respectively.

INVENTORIES

INVENTORIES	6 Months Ended
	Sep. 30, 2013
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
		September 30,		March 31,
		2013		2013
		(dollars in thousands)
	Raw Materials and Material-in-Progress	$	71,298	$	56,019
	Finished Cement		12,327		18,077
	Gypsum Wallboard		6,112		6,855
	Aggregates		12,421		16,837
	Paperboard		3,412		2,867
	Repair Parts and Supplies		51,011		49,361
	Fuel and Coal		5,513		6,364
		$	162,094	$	156,380

ACCRUED_EXPENSES

ACCRUED EXPENSES	6 Months Ended
	Sep. 30, 2013
Payables And Accruals [Abstract]	'
ACCRUED EXPENSES	'
	(G) ACCRUED EXPENSES
	Accrued expenses consist of the following:
		As of
		September 30,		March 31,
		2013		2013
		(dollars in thousands)
	Payroll and Incentive Compensation	$	11,145	$	11,827
	Benefits		9,662		10,349
	Interest		4,813		4,813
	Property Taxes		4,967		3,235
	Power and Fuel		2,539		3,146
	Sales and Use Tax		1,129		591
	Acquisition Related Expenses		—		2,023
	Other		6,530		5,365
		$	40,785	$	41,349

SHAREBASED_EMPLOYEE_COMPENSATI

SHARE-BASED EMPLOYEE COMPENSATION	6 Months Ended
	Sep. 30, 2013
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 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 August 2013, the Compensation Committee of the Board of Directors approved an incentive equity award of an aggregate of 206,914 stock options pursuant to the Plan to certain individuals that vest ratably over a three year period (the “Fiscal 2014 Employee Stock Option Grant”). The options have a term of ten years from the date of grant. In August 2013, we granted 30,075 options to members of the Board of Directors (the “Fiscal 2014 Board of Directors Grant”). Options granted under the Fiscal 2014 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 2014 Employee Stock Option Grant and Fiscal 2014 Board of Directors Grant 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 2014 are as follows:
		Fiscal 2014
	Dividend Yield		2	%
	Expected Volatility		44.6	%
	Risk Free Interest Rate		2	%
	Expected Life		7.0 years
	Stock option expense for all outstanding stock option awards totaled approximately $1.9 million and $2.7 million for the three and six month periods ended September 30, 2013, respectively, and $1.3 million and $1.8 million for the three and six month periods ended September 30, 2012, respectively. At September 30, 2013, there was approximately $10.3 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 2.4 years.
	The following table represents stock option activity for the six month period ended September 30, 2013:
		Number			Weighted-
		of			Average
		Shares			Exercise
					Price
	Outstanding Options at Beginning of Period		3,022,592		$	37.83
	Granted		236,989		$	67.21
	Exercised		(70,837	)	$	33.19
	Cancelled		(5,000	)	$	53.22
	Outstanding Options at End of Period		3,183,744		$	40.1
	Options Exercisable at End of Period		1,230,175		$	30.68
	Weighted-Average Fair Value of Options Granted during the Period	$	26.04
	The following table summarizes information about stock options outstanding at September 30, 2013:
		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		1,006,370			4.98	$	26.74		886,941	$	26.62
	$33.08 - $ 40.78		626,719			7.45	$	34.57		274,993	$	35.34
	$47.53 - $ 70.30		1,550,655			2.26	$	51.01		68,241	$	64.76
			3,183,744			4.14	$	40.1		1,230,175	$	30.68
	At September 30, 2013, the aggregate intrinsic value for outstanding and exercisable options was approximately $103.3 million and $37.7 million, respectively. The total intrinsic value of options exercised during the six month period ended September 30, 2013 was approximately $2.9 million.
	Restricted Stock Units. There was no expense related to RSUs for the three and six month periods ended September 30, 2013, respectively, and $0.4 million and $0.8 million for the three and six month periods ended September 30, 2012, respectively.
	Restricted Stock. In August 2013, the Compensation Committee also approved the granting of an aggregate of 93,186 shares of restricted stock to certain key employees at both the corporate and subsidiary level (the “Fiscal 2014 Employee Restricted Stock Award”) that will be earned if our ten year return on equity is at least 15% at March 31, 2014. 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, the earned shares will lapse ratably over five years, with the first fifth lapsing promptly following the vesting determination date, and the remaining restrictions lapsing on March 31, 2015 through 2018. The value of the Fiscal 2014 Employee Restricted Stock Award, net of estimated forfeitures, is being expensed over a five year period. In August 2013, we granted 5,761 shares of restricted stock to members of the Board of Directors (the “Board of Directors Fiscal 2014 Restricted Stock Award”). Awards issued under the Board of Directors Fiscal 2014 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 $1.2 million and $2.1 million for the three and six month periods ended September 30, 2013, respectively, and $0.9 million and $1.6 million for the three and six month periods ended September 30, 2012, respectively. At September 30, 2013, there was approximately $17.7 million of unearned compensation from restricted stock, net of estimated forfeitures, which will be recognized over a weighted-average period of 3.7 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 3,973,459 at September 30, 2013.

COMPUTATION_OF_EARNINGS_PER_SH

COMPUTATION OF EARNINGS PER SHARE	6 Months Ended
	Sep. 30, 2013
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 Six Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
	Weighted-Average Shares of Common Stock Outstanding		49,012,045			44,746,225			48,984,038			44,708,499
	Common Equivalent Shares:
	Assumed Exercise of Outstanding Dilutive Options		1,682,592			1,711,195			1,692,782			1,428,889
	Less: Shares Repurchased from Assumed Proceeds of Assumed Exercised Options		(1,134,329	)		(1,371,038	)		(1,137,668	)		(1,162,751	)
	Restricted Shares		299,792			267,396			296,230			244,587
	Weighted-Average Common and Common Equivalent Shares Outstanding		49,860,100			45,353,778			49,835,382			45,219,224
	Shares Excluded Due to Anti-dilution Effects		121,957			1,935,783			71,479			2,126,953

PENSION_AND_EMPLOYEE_BENEFIT_P

PENSION AND EMPLOYEE BENEFIT PLANS	6 Months Ended
	Sep. 30, 2013
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						For the Six Months
		Ended  September 30,						ended  September 30,
		2013			2012			2013			2012
		(dollars in						(dollars in
		thousands)						thousands)
	Service Cost – Benefits Earned During the Period	$	197		$	132		$	393		$	264
	Interest Cost of Benefit Obligations		306			268			611			536
	Expected Return on Plan Assets		(343	)		(342	)		(686	)		(684	)
	Recognized Net Actuarial Loss		247			177			492			354
	Amortization of Prior-Service Cost		2			14			8			28
	Net Periodic Pension Cost	$	409		$	249		$	818		$	498

INCOME_TAXES

INCOME TAXES	6 Months Ended
	Sep. 30, 2013
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 six months ended September 30, 2013 was approximately 32%, 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 2014.

LONGTERM_DEBT

LONG-TERM DEBT	6 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
LONG-TERM DEBT	'
	(L) LONG-TERM DEBT
	Long-term debt consists of the following:
		As of
		September 30,		March 31,
		2013		2013
		(dollars in thousands)
	Amended Credit Facility	$	263,000	$	297,000
	Senior Notes		192,259		192,259
	Total Debt	$	455,259	$	489,259
	Credit Facility -
	On December 16, 2010, we entered into a $300.0 million revolving Credit Facility, which was amended on September 26, 2012 and is scheduled to expire on December 16, 2015. The recent amendment to the Credit Facility increased available revolving borrowings from $300.0 million to $400.0 million (including an increase in the swingline loan sublimit from $15.0 million to $25.0 million) and changed certain provisions in the negative covenants in order to allow for or facilitate the Acquisition, as well as to implement certain related changes to the financial covenants. These financial covenant changes primarily related to amending the definition of Consolidated EBITDA to allow the add-back to consolidated net income of certain transaction and other allocated overhead costs related to the Acquisition that are not expected to be incurred in the future. Borrowings under the Credit Facility are guaranteed by substantially all of the Company’s subsidiaries. At the option of the Company, outstanding principal amounts on the 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 up to a period of six months at the option of the Company. The Company is also required to pay a commitment fee on unused available borrowings under the Credit Facility ranging from 10 to 35 basis points depending upon the Leverage Ratio. The Credit Facility contains customary covenants that restrict our ability to incur additional debt, encumber our assets, sell assets, make or enter into certain investments, loans or guaranties and enter into sale and leaseback arrangements. The Credit Facility also requires us to maintain a consolidated indebtedness ratio (calculated as consolidated indebtedness to consolidated earnings before interest, taxes, depreciation, amortization, certain transaction-related deductions and other non-cash deductions) of 3.5:1.0 or less and an interest coverage ratio (consolidated earnings before interest, taxes, depreciation, amortization, certain transaction-related deductions and other non-cash deductions to consolidated interest expense) of at least 2.5:1.0. The Credit Facility also limits our ability to make certain restricted payments, such as paying cash dividends; however, there are several exceptions to this restriction, including: (i) the Company may pay cash dividends in an aggregate amount of up to $50.0 million each fiscal year; and (ii) the Company may make restricted payments not otherwise permitted so long as, in each case, no default would result therefrom and our consolidated funded indebtedness ratio does not exceed 3.0:1.0. We had $263.0 million of borrowings outstanding under the Credit Facility at September 30, 2013. Based on our Leverage Ratio, we had $129.6 million of available borrowings, net of the outstanding letters of credit, under the Credit Facility at September 30, 2013.
	The 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 September 30, 2013, we had $7.4 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		15-Nov-17		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). Following the repurchase, the amounts outstanding for each of the four tranches are as follows:
		Principal		Maturity Date		Interest Rate
	Tranche A	$	9.5 million		October 2, 2014		6.08	%
	Tranche B	$	8.0 million		2-Oct-16		6.27	%
	Tranche C	$	24.0 million		2-Oct-17		6.36	%
	Tranche D	$	36.5 million		2-Oct-19		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.
	We amended both the 2005 Note Purchase Agreement and 2007 Note Purchase Agreement (collectively, the “Note Purchase Agreements”) on September 26, 2012. The amendment to each Note Purchase Agreement, among other things, mirrors the amendments to the Credit Facility, by changing certain provisions in the negative covenants in order to allow for and facilitate the Acquisition, as well as to implement certain related changes to the financial covenants. These financial covenant changes primarily related to amending the definition of Consolidated EBITDA to allow the add-back to consolidated net income of certain transaction and other allocated overhead costs related to the Acquisition that are not expected to be incurred in the future as well as reasonably identifiable cost savings, improvements and synergies related to the purchase of the Acquired Assets.
	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 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 Credit Facility. We were in compliance with all financial ratios and tests at September 30, 2013 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.
	As a result of the Acquisition, we succeeded to the leasehold interest held by Lafarge North America with respect to the cement plant located in Sugar Creek, Missouri, as well as its obligations under certain related industrial revenue bonds. In 1998, Lafarge North America had entered into a series of agreements, which were later amended in 2003, with the City of Sugar Creek, Missouri, in connection with the construction of improvements at the Sugar Creek cement plant. Under these agreements, Lafarge North America leased the Sugar Creek cement plant from the City of Sugar Creek, Missouri, which issued $150.0 million of tax-exempt and taxable industrial revenue bonds to partly finance the construction of such improvements. The lease payments due to the City of Sugar Creek under the Sugar Creek cement plant lease 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. Upon the closing of the Acquisition, funds for the retirement of $47.0 million of the industrial revenue bonds were placed into escrow by Lafarge North America, resulting in the defeasement of such bonds and leaving $103.0 million of industrial revenue bonds outstanding. The defeased bonds were subsequently paid in full in June 2013. The remaining $103.0 million of industrial revenue bonds held by Lafarge North America were transferred to a wholly owned subsidiary of the Company in connection with the Acquisition. Because we are now 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 Sugar Creek cement plant.
	On August 31, 2011, we entered into an Uncommitted Master Shelf Agreement (the “Shelf Agreement”) with John Hancock Life Insurance Company (U.S.A.) (“Hancock”). The Shelf Agreement provided the terms under which the Company could offer up to $75 million of its senior unsecured notes for purchase by Hancock or Hancock’s affiliates that become bound by the Shelf Agreement (collectively, “Purchasers”). The Shelf Agreement did not obligate the Company to sell, or the Purchasers to buy, any such notes, and had a term of two years. We did not sell any notes pursuant to the Shelf Agreement prior to its expiration on August 31, 2013.

SEGMENT_INFORMATION

SEGMENT INFORMATION	6 Months Ended
	Sep. 30, 2013
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.
	We operate in four business segments: Cement, Gypsum Wallboard, Recycled Paperboard, and Concrete and Aggregates, with Cement and Gypsum Wallboard 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, gravel and 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 and a frac sand processing plant. 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 in Texas.
	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 Six Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
		(dollars in thousands)						(dollars in thousands)
	Revenues -
	Cement	$	133,204		$	78,533		$	250,904		$	154,557
	Gypsum Wallboard		98,960			77,327			194,941			147,547
	Paperboard		34,642			31,730			66,805			62,059
	Concrete and Aggregates		30,097			14,257			55,303			27,134
	Sub-total		296,903			201,847			567,953			391,297
	Less: Intersegment Revenues		(16,879	)		(13,272	)		(32,481	)		(24,973	)
	Net Revenues, including Joint Venture		280,024			188,575			535,472			366,324
	Less: Joint Venture		(27,378	)		(23,916	)		(55,782	)		(47,623	)
	Net Revenues	$	252,646		$	164,659		$	479,690		$	318,701
		For the Three Months						For the Six Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
		(dollars in thousands)						(dollars in thousands)
	Intersegment Revenues -
	Cement	$	2,955		$	512		$	4,947		$	1,079
	Paperboard		13,650			12,515			26,862			23,437
	Concrete and Aggregates		274			245			672			457
		$	16,879		$	13,272		$	32,481		$	24,973
	Cement Sales Volume (in thousands of tons) -
	Wholly –owned Operations		1,182			639			2,161			1,260
	Joint Venture		252			225			514			452
			1,434			864			2,675			1,712
		For the Three Months						For the Six Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
		(dollars in thousands)						(dollars in thousands)
	Operating Earnings -
	Cement	$	32,430		$	17,442		$	51,440		$	27,308
	Gypsum Wallboard		29,868			16,464			59,504			30,486
	Paperboard		6,937			7,695			12,616			12,971
	Concrete and Aggregates		(9	)		(362	)		148			(161	)
	Other, net		317			66			900			(204	)
	Sub-total		69,543			41,305			124,608			70,400
	Corporate General and Administrative		(6,060	)		(5,919	)		(11,654	)		(10,674	)
	Acquisition and Litigation Expense		—			(5,713	)		—			(6,374	)
	Earnings Before Interest and Income Taxes		63,483			29,673			112,954			53,352
	Interest Expense, net		(4,795	)		(3,548	)		(9,750	)		(7,313	)
	Earnings Before Income Taxes	$	58,688		$	26,125		$	103,204		$	46,039
	Cement Operating Earnings -
	Wholly –owned Operations	$	22,683		$	8,692		$	33,815		$	12,090
	Joint Venture		9,747			8,750			17,625			15,218
		$	32,430		$	17,442		$	51,440		$	27,308
	Capital Expenditures -
	Cement	$	2,069		$	951		$	5,836		$	4,947
	Gypsum Wallboard		602			1,268			1,699			1,464
	Paperboard		1,364			145			1,901			366
	Aggregates		5,468			1,556			21,016			1,791
	Concrete		843			16			1,131			53
	Other		—			7			—			7
		$	10,346		$	3,943		$	31,583		$	8,628
	Depreciation, Depletion and Amortization -
	Cement	$	7,811		$	3,924		$	15,648		$	7,733
Gypsum Wallboard		5,261			5,269			10,544			10,546
Paperboard		2,171			2,209			4,353			4,419
Aggregates		1,277			896			2,556			1,783
Concrete		433			268			830			536
Other, net		450			217			693			427
	$	17,403		$	12,783		$	34,624		$	25,444
	As of
	September 30,			March 31,
	2013			2013
	(dollars in thousands)
Identifiable Assets -
Cement	$	759,434		$	756,158
Gypsum Wallboard		415,799			425,866
Paperboard		127,391			129,226
Aggregates		146,700			108,796
Concrete		30,426			27,187
Corporate and Other		30,425			29,000
	$	1,510,175		$	1,476,233
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
	September 30,			March 31,
	2013			2013
	(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 September 30, 2013, 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 $3.0 million, and the carrying value of the equipment was $2.2 million at September 30, 2013, 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 improves. 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 Six Months
	Ended September 30,						Ended September 30,
	2013			2012			2013			2012
	(dollars in thousands)						(dollars in thousands)
Revenues	$	54,756		$	48,057		$	111,564		$	95,944
Gross Margin	$	20,641		$	18,580		$	37,335		$	32,489
Earnings Before Income Taxes	$	19,649		$	17,501		$	35,568		$	30,437
	As of
	September 30,			March 31,
	2013			2013
	(dollars in thousands)
Current Assets	$	52,548		$	53,059
Non-Current Assets	$	42,691		$	44,120
Current Liabilities	$	18,631		$	12,913

INTEREST_EXPENSE

INTEREST EXPENSE	6 Months Ended
	Sep. 30, 2013
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 Six Months
		Ended  September 30,						Ended September 30,
		2013			2012			2013			2012
		(dollars in thousands)						(dollars in thousands)
	Interest (Income)	$	(1	)	$	(3	)	$	(2	)	$	(4	)
	Interest Expense		4,410			3,342			8,969			6,893
	Interest Expense – Income Taxes		163			91			326			188
	Other Expenses		223			118			457			236
	Interest Expense, net	$	4,795		$	3,548		$	9,750		$	7,313
	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	6 Months Ended
	Sep. 30, 2013
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 September 30, 2013, we had contingent liabilities under these outstanding letters of credit of approximately $7.4 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 $16.1 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.
	The IRS has completed its examinations of our federal income tax returns for fiscal years ended March 31, 2001 through March 31, 2010. 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 tax years, in which it denied certain depreciation deductions claimed by us with respect to assets acquired from Republic Group LLC in November 2000 (the “Republic Assets”). In addition, on October 5, 2012, the IRS issued a 30-day letter related to the examination of the tax returns for fiscal years ended March 31, 2007 through March 31, 2010, denying certain depreciation deductions claimed by us with respect to the Republic Assets, similar to the actions taken by the IRS for our tax years ended March 31, 2001 through March 31, 2006, described above.
	In June 2010, we received a Notice of Deficiency (“Notice”) of $71.5 million of taxes and penalties for the fiscal years ended March 31, 2001 through 2006, inclusive, related to the IRS audit of the Republic Asset Acquisition. The Notice was in substantial agreement with our financial accruals, including interest. The total amount related to the Notice, including interest, was approximately $98.7 million, of which $75 million had previously been deposited with the IRS. We deposited the remaining $23.7 million with the IRS in July 2010 and asked the IRS to apply all $98.7 million of deposits to the payment of the tax, penalties and interest. Subsequent review of the IRS interest billing produced a refund of $0.8 million reducing the net outlay to $97.9 million. Refund claims were filed with the IRS in October 2010 to recover all $97.9 million, plus interest. The IRS has denied our refund request and we filed a lawsuit in May 2011 in Federal District Court to recover the requested refunds. In September 2013 the judge heard arguments on each party’s motion for summary judgment and took each motion under advisement. Additionally, the judge suspended the December 2013 trial date without setting a new date.
	With respect to the tax returns for the fiscal years ended March 31, 2007 through March 31, 2010, the IRS has issued an assessment of approximately $8.1 million of income tax and approximately $1.9 million in penalties relating to the acquisition of the Republic Assets. In addition, we estimate that interest of approximately $2.3 million has accrued on these amounts as of September 30, 2013. These amounts have been fully accrued in our financial statements at September 30, 2013. The amounts accrued have been treated as unrecognized tax liabilities and are included in Other Long Term Liabilities on our Consolidated Balance Sheet at September 30, 2013. On October 31, 2012, we appealed the findings of the examiner to the IRS Appeals Office, contesting the assessment of tax, penalties and interest for fiscal years ended March 31, 2007 through March 31, 2010. In March 2013, the IRS agreed to suspend the audit for tax years 2007 through 2011 pending the outcome of our case in Federal District Court.
	In the event we reach a settlement through negotiation or in the courts, we will reverse any accrued taxes, interest and penalties in excess of the negotiated settlement through the Consolidated Statement of Earnings. At this time, we are unable to predict with certainty the ultimate outcome or how much of the amounts paid for tax, interest, and penalties to the IRS and state taxing authorities will be recovered, if any.

FAIR_VALUE_OF_FINANCIAL_INSTRU

FAIR VALUE OF FINANCIAL INSTRUMENTS	6 Months Ended
	Sep. 30, 2013
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 September 30, 2013 is as follows:
		Fair Value
		(dollars in thousands)
	Series 2005A Tranche B	$	59,897
	Series 2005A Tranche C		61,047
	Series 2007A Tranche A		9,814
	Series 2007A Tranche B		8,684
	Series 2007A Tranche C		26,340
	Series 2007A Tranche D		40,369
	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 September 30, 2013 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 September 30, 2013.

Acquisition_Tables

Acquisition (Tables)	6 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]	'
Components of Purchase Price Allocation	'
	Based on the fair value of tangible and intangible assets acquired and liabilities assumed the purchase price is allocated as follows:
	Purchase Price Allocation (in thousands)
	Cash and cash equivalents	$	—
	Accounts Receivable		23,432
	Inventories		20,361
	Prepaid and Other Assets		3,511
	Property and Equipment		407,260
	Intangible Assets		12,500
	Accounts Payable		(9,070	)
	Accrued Liabilities		(3,501	)
	Other Long-term Liabilities		(1,060	)
	Total Net Assets		453,433
	Goodwill		—
	Initial Purchase Price	$	453,433
	Final Working Capital Adjustment		(2,734	)
	Final Purchase Price	$	450,699
Summary of Fair Value Estimates of Identifiable Intangible Assets and Weighted-Average Useful Lives	'
	The following table is a summary of the fair value estimates of the identifiable intangible assets (in thousands) and their weighted-average useful lives:
		Weighted			Fair Value
		Average Life
	Customer Relationships		15		$	4,760
	Sales Contracts		4			2,500
	Permits		40			5,240
	Total Intangible Assets				$	12,500
Net Sales and Operating Income of Acquired Assets	'
	The following table presents the net sales and operating income of the Acquired Assets that have been included in our consolidated statement of earnings from April 1, 2013 through September 30, 2013:
		Three Month Period			Six Month Period
		Ended September 30, 2013			Ended September 30, 2013
		(dollars in thousands)
	Net Sales	$	52,603		$	93,683
	Operating Income	$	12,288		$	18,713
Unaudited Pro Forma Results	'
		Three Month Period			Six Month Period
		Ended September 30, 2012			Ended September 30, 2012
		(dollars in thousands)
	Revenues	$	222,665		$	431,124
	Net Income	$	22,286		$	37,193
	Earnings per share - basic	$	0.46		$	0.77
	Earnings per share - diluted	$	0.46		$	0.76
	Weighted Average Shares Outstanding:
	Basic		48,196,225			48,158,499
	Diluted		48,803,778			48,669,224

STOCKHOLDERS_EQUITY_Tables

STOCKHOLDERS EQUITY (Tables)	6 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Summary of Changes in Stockholders Equity	'
	A summary of changes in stockholders’ equity follows:
		For the Six Months
		Ended  September 30, 2013
		(dollars in thousands)
	Common Stock –
	Balance at Beginning of Period	$	495
	Stock Option Exercises		2
	Balance at End of Period		497
	Capital in Excess of Par Value –
	Balance at Beginning of Period		224,053
	Stock Compensation Expense		4,814
	Shares Redeemed to Settle Employee Taxes		(435	)
	Stock Option Exercises		3,404
	Balance at End of Period		231,836
	Retained Earnings –
	Balance at Beginning of Period		478,664
	Dividends Declared to Stockholders		(9,949	)
	Net Earnings		70,004
	Balance at End of Period		538,719
	Accumulated Other Comprehensive Loss -
	Balance at Beginning of Period		(7,042	)
	Change in Funded Status of Pension Plan, net of tax		310
	Balance at End of Period		(6,732	)
	Total Stockholders’ Equity	$	764,320

INVENTORIES_Tables

INVENTORIES (Tables)	6 Months Ended
	Sep. 30, 2013
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
		September 30,		March 31,
		2013		2013
		(dollars in thousands)
	Raw Materials and Material-in-Progress	$	71,298	$	56,019
	Finished Cement		12,327		18,077
	Gypsum Wallboard		6,112		6,855
	Aggregates		12,421		16,837
	Paperboard		3,412		2,867
	Repair Parts and Supplies		51,011		49,361
	Fuel and Coal		5,513		6,364
		$	162,094	$	156,380

ACCRUED_EXPENSES_Tables

ACCRUED EXPENSES (Tables)	6 Months Ended
	Sep. 30, 2013
Payables And Accruals [Abstract]	'
Schedule of Accrued Expenses	'
	Accrued expenses consist of the following:
		As of
		September 30,		March 31,
		2013		2013
		(dollars in thousands)
	Payroll and Incentive Compensation	$	11,145	$	11,827
	Benefits		9,662		10,349
	Interest		4,813		4,813
	Property Taxes		4,967		3,235
	Power and Fuel		2,539		3,146
	Sales and Use Tax		1,129		591
	Acquisition Related Expenses		—		2,023
	Other		6,530		5,365
		$	40,785	$	41,349

SHAREBASED_EMPLOYEE_COMPENSATI1

SHARE-BASED EMPLOYEE COMPENSATION (Tables)	6 Months Ended
	Sep. 30, 2013
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 2014 are as follows:
		Fiscal 2014
	Dividend Yield		2	%
	Expected Volatility		44.6	%
	Risk Free Interest Rate		2	%
	Expected Life		7.0 years
Stock Option Activity	'
	The following table represents stock option activity for the six month period ended September 30, 2013:
		Number			Weighted-
		of			Average
		Shares			Exercise
					Price
	Outstanding Options at Beginning of Period		3,022,592		$	37.83
	Granted		236,989		$	67.21
	Exercised		(70,837	)	$	33.19
	Cancelled		(5,000	)	$	53.22
	Outstanding Options at End of Period		3,183,744		$	40.1
	Options Exercisable at End of Period		1,230,175		$	30.68
	Weighted-Average Fair Value of Options Granted during the Period	$	26.04
Stock Options Outstanding	'
	The following table summarizes information about stock options outstanding at September 30, 2013:
		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		1,006,370			4.98	$	26.74		886,941	$	26.62
	$33.08 - $ 40.78		626,719			7.45	$	34.57		274,993	$	35.34
	$47.53 - $ 70.30		1,550,655			2.26	$	51.01		68,241	$	64.76
			3,183,744			4.14	$	40.1		1,230,175	$	30.68

COMPUTATION_OF_EARNINGS_PER_SH1

COMPUTATION OF EARNINGS PER SHARE (Tables)	6 Months Ended
	Sep. 30, 2013
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 Six Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
	Weighted-Average Shares of Common Stock Outstanding		49,012,045			44,746,225			48,984,038			44,708,499
	Common Equivalent Shares:
	Assumed Exercise of Outstanding Dilutive Options		1,682,592			1,711,195			1,692,782			1,428,889
	Less: Shares Repurchased from Assumed Proceeds of Assumed Exercised Options		(1,134,329	)		(1,371,038	)		(1,137,668	)		(1,162,751	)
	Restricted Shares		299,792			267,396			296,230			244,587
	Weighted-Average Common and Common Equivalent Shares Outstanding		49,860,100			45,353,778			49,835,382			45,219,224
	Shares Excluded Due to Anti-dilution Effects		121,957			1,935,783			71,479			2,126,953

PENSION_AND_EMPLOYEE_BENEFIT_P1

PENSION AND EMPLOYEE BENEFIT PLANS (Tables)	6 Months Ended
	Sep. 30, 2013
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						For the Six Months
		Ended  September 30,						ended  September 30,
		2013			2012			2013			2012
		(dollars in						(dollars in
		thousands)						thousands)
	Service Cost – Benefits Earned During the Period	$	197		$	132		$	393		$	264
	Interest Cost of Benefit Obligations		306			268			611			536
	Expected Return on Plan Assets		(343	)		(342	)		(686	)		(684	)
	Recognized Net Actuarial Loss		247			177			492			354
	Amortization of Prior-Service Cost		2			14			8			28
	Net Periodic Pension Cost	$	409		$	249		$	818		$	498

LONGTERM_DEBT_Tables

LONG-TERM DEBT (Tables)	6 Months Ended
	Sep. 30, 2013
Long-Term Debt	'
	Long-term debt consists of the following:
		As of
		September 30,		March 31,
		2013		2013
		(dollars in thousands)
	Amended Credit Facility	$	263,000	$	297,000
	Senior Notes		192,259		192,259
	Total Debt	$	455,259	$	489,259
2005 Note Purchase Agreement [Member]	'
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		15-Nov-17		5.48	%
2007 Note Purchase Agreement [Member]	'
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 A	$	9.5 million		October 2, 2014		6.08	%
	Tranche B	$	8.0 million		2-Oct-16		6.27	%
	Tranche C	$	24.0 million		2-Oct-17		6.36	%
	Tranche D	$	36.5 million		2-Oct-19		6.48	%

SEGMENT_INFORMATION_Tables

SEGMENT INFORMATION (Tables)	6 Months Ended
	Sep. 30, 2013
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 Six Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
		(dollars in thousands)						(dollars in thousands)
	Revenues -
	Cement	$	133,204		$	78,533		$	250,904		$	154,557
	Gypsum Wallboard		98,960			77,327			194,941			147,547
	Paperboard		34,642			31,730			66,805			62,059
	Concrete and Aggregates		30,097			14,257			55,303			27,134
	Sub-total		296,903			201,847			567,953			391,297
	Less: Intersegment Revenues		(16,879	)		(13,272	)		(32,481	)		(24,973	)
	Net Revenues, including Joint Venture		280,024			188,575			535,472			366,324
	Less: Joint Venture		(27,378	)		(23,916	)		(55,782	)		(47,623	)
	Net Revenues	$	252,646		$	164,659		$	479,690		$	318,701
		For the Three Months						For the Six Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
		(dollars in thousands)						(dollars in thousands)
	Intersegment Revenues -
	Cement	$	2,955		$	512		$	4,947		$	1,079
	Paperboard		13,650			12,515			26,862			23,437
	Concrete and Aggregates		274			245			672			457
		$	16,879		$	13,272		$	32,481		$	24,973
	Cement Sales Volume (in thousands of tons) -
	Wholly –owned Operations		1,182			639			2,161			1,260
	Joint Venture		252			225			514			452
			1,434			864			2,675			1,712
		For the Three Months						For the Six Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
		(dollars in thousands)						(dollars in thousands)
	Operating Earnings -
	Cement	$	32,430		$	17,442		$	51,440		$	27,308
	Gypsum Wallboard		29,868			16,464			59,504			30,486
	Paperboard		6,937			7,695			12,616			12,971
	Concrete and Aggregates		(9	)		(362	)		148			(161	)
	Other, net		317			66			900			(204	)
	Sub-total		69,543			41,305			124,608			70,400
	Corporate General and Administrative		(6,060	)		(5,919	)		(11,654	)		(10,674	)
	Acquisition and Litigation Expense		—			(5,713	)		—			(6,374	)
	Earnings Before Interest and Income Taxes		63,483			29,673			112,954			53,352
	Interest Expense, net		(4,795	)		(3,548	)		(9,750	)		(7,313	)
	Earnings Before Income Taxes	$	58,688		$	26,125		$	103,204		$	46,039
	Cement Operating Earnings -
	Wholly –owned Operations	$	22,683		$	8,692		$	33,815		$	12,090
	Joint Venture		9,747			8,750			17,625			15,218
		$	32,430		$	17,442		$	51,440		$	27,308
	Capital Expenditures -
	Cement	$	2,069		$	951		$	5,836		$	4,947
	Gypsum Wallboard		602			1,268			1,699			1,464
	Paperboard		1,364			145			1,901			366
	Aggregates		5,468			1,556			21,016			1,791
	Concrete		843			16			1,131			53
	Other		—			7			—			7
		$	10,346		$	3,943		$	31,583		$	8,628
	Depreciation, Depletion and Amortization -
	Cement	$	7,811		$	3,924		$	15,648		$	7,733
	Gypsum Wallboard		5,261			5,269			10,544			10,546
	Paperboard		2,171			2,209			4,353			4,419
	Aggregates		1,277			896			2,556			1,783
	Concrete		433			268			830			536
	Other, net		450			217			693			427
	$	17,403		$	12,783		$	34,624		$	25,444
	As of
	September 30,			March 31,
	2013			2013
	(dollars in thousands)
Identifiable Assets -
Cement	$	759,434		$	756,158
Gypsum Wallboard		415,799			425,866
Paperboard		127,391			129,226
Aggregates		146,700			108,796
Concrete		30,426			27,187
Corporate and Other		30,425			29,000
	$	1,510,175		$	1,476,233
Segment Breakdown of Goodwill	'
	The segment breakdown of goodwill is as follows:
		As of
		September 30,			March 31,
		2013			2013
		(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 Six Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
		(dollars in thousands)						(dollars in thousands)
	Revenues	$	54,756		$	48,057		$	111,564		$	95,944
	Gross Margin	$	20,641		$	18,580		$	37,335		$	32,489
	Earnings Before Income Taxes	$	19,649		$	17,501		$	35,568		$	30,437
		As of
		September 30,			March 31,
		2013			2013
		(dollars in thousands)
	Current Assets	$	52,548		$	53,059
	Non-Current Assets	$	42,691		$	44,120
	Current Liabilities	$	18,631		$	12,913

INTEREST_EXPENSE_Tables

INTEREST EXPENSE (Tables)	6 Months Ended
	Sep. 30, 2013
Banking And Thrift Interest [Abstract]	'
Interest Expense, Net	'
	The following components are included in interest expense, net:
		For the Three Months						For the Six Months
		Ended  September 30,						Ended September 30,
		2013			2012			2013			2012
		(dollars in thousands)						(dollars in thousands)
	Interest (Income)	$	(1	)	$	(3	)	$	(2	)	$	(4	)
	Interest Expense		4,410			3,342			8,969			6,893
	Interest Expense – Income Taxes		163			91			326			188
	Other Expenses		223			118			457			236
	Interest Expense, net	$	4,795		$	3,548		$	9,750		$	7,313

FAIR_VALUE_OF_FINANCIAL_INSTRU1

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	6 Months Ended
	Sep. 30, 2013
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 September 30, 2013 is as follows:
		Fair Value
		(dollars in thousands)
	Series 2005A Tranche B	$	59,897
	Series 2005A Tranche C		61,047
	Series 2007A Tranche A		9,814
	Series 2007A Tranche B		8,684
	Series 2007A Tranche C		26,340
	Series 2007A Tranche D		40,369

Acquisition_Additional_Informa

Acquisition - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Nov. 30, 2012
Business Acquisition [Line Items]	'	'	'
Purchase price	'	'	$450,699,000
Final Working Capital Adjustment	'	'	2,734,000
Direct acquisition cost	$6,100,000	$6,100,000	'
Asset Purchase Agreement [Member] | Cement [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Number of business assets acquired	'	'	2
Asset Purchase Agreement [Member] | Aggregates Quarries [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Number of business assets acquired	'	'	2
Asset Purchase Agreement [Member] | Ready-mix Plants [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Number of business assets acquired	'	'	8

Components_of_Purchase_Price_A

Components of Purchase Price Allocation (Detail) (USD $)	Sep. 30, 2013	Nov. 30, 2012
In Thousands, unless otherwise specified
Business Combinations [Abstract]	'	'
Cash and cash equivalents	'	'
Accounts Receivable	'	23,432
Inventories	'	20,361
Prepaid and Other Assets	'	3,511
Property and Equipment	'	407,260
Intangible Assets	12,500	12,500
Accounts Payable	'	-9,070
Accrued Liabilities	'	-3,501
Other Long-term Liabilities	'	-1,060
Total Net Assets	'	453,433
Goodwill	'	'
Initial Purchase Price	'	453,433
Final Working Capital Adjustment	'	-2,734
Final Purchase Price	'	$450,699

Summary_of_Fair_Value_Estimate

Summary of Fair Value Estimates of Identifiable Intangible Assets and Weighted-Average Useful Lives (Detail) (USD $)	Sep. 30, 2013	Nov. 30, 2012	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified			Customer Relationships [Member]	Sales contracts [Member]	Permits [Member]
Business Acquisition [Line Items]	'	'	'	'	'
Weighted Average Life	'	'	'15 years	'4 years	'40 years
Fair Value	$12,500	$12,500	$4,760	$2,500	$5,240

Net_Sales_and_Operating_Income

Net Sales and Operating Income of Acquired Assets (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'	'	'
Operating Income	$69,543	$41,305	$124,608	$70,400
Recently Acquired Assets [Member]	'	'	'	'
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'	'	'	'
Net Sales	52,603	'	93,683	'
Operating Income	$12,288	'	$18,713	'

Unaudited_Pro_Forma_Results_De

Unaudited Pro Forma Results (Detail) (USD $)	3 Months Ended	6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2012
Business Combinations [Abstract]	'	'
Revenues	$222,665	$431,124
Net Income	$22,286	$37,193
Earnings per share - basic	$0.46	$0.77
Earnings per share - diluted	$0.46	$0.76
Weighted Average Shares Outstanding:	'	'
Basic	48,196,225	48,158,499
Diluted	48,803,778	48,669,224

Accounts_and_Notes_Receivable_

Accounts and Notes Receivable - Additional Information (Detail) (USD $)	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2013	Sep. 30, 2013
In Millions, unless otherwise specified			Minimum [Member]	Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'
Allowance for doubtful accounts	$5.20	$5.10	'	'
Notes receivable, total	9.7	'	'	'
Note receivable, current	$6.20	'	'	'
Notes receivable interest rate over prime rate	1.50%	'	'	'
Notes receivable, maturity year	'	'	'2014	'2017

Summary_of_Changes_in_Stockhol

Summary of Changes in Stockholders' Equity (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stockholders Equity Note [Line Items]	'	'	'	'
Balance at Beginning of Period	'	'	$696,170	'
Net Earnings	39,903	17,953	70,004	31,931
Balance at End of Period	764,320	'	764,320	'
Common Stock [Member]	'	'	'	'
Stockholders Equity Note [Line Items]	'	'	'	'
Balance at Beginning of Period	'	'	495	'
Stock Option Exercises	'	'	2	'
Balance at End of Period	497	'	497	'
Capital in Excess of Par Value [Member]	'	'	'	'
Stockholders Equity Note [Line Items]	'	'	'	'
Balance at Beginning of Period	'	'	224,053	'
Stock Compensation Expense	'	'	4,814	'
Shares Redeemed to Settle Employee Taxes	'	'	-435	'
Stock Option Exercises	'	'	3,404	'
Balance at End of Period	231,836	'	231,836	'
Retained Earnings [Member]	'	'	'	'
Stockholders Equity Note [Line Items]	'	'	'	'
Balance at Beginning of Period	'	'	478,664	'
Dividends Declared to Stockholders	'	'	-9,949	'
Net Earnings	'	'	70,004	'
Balance at End of Period	538,719	'	538,719	'
Accumulated Other Comprehensive Loss [Member]	'	'	'	'
Stockholders Equity Note [Line Items]	'	'	'	'
Balance at Beginning of Period	'	'	-7,042	'
Change in Funded Status of Pension Plan, net of tax	'	'	310	'
Balance at End of Period	($6,732)	'	($6,732)	'

Stockholders_Equity_Additional

Stockholders Equity - Additional Information (Detail)	Sep. 30, 2013
Equity [Abstract]	'
Number of additional shares authorized to be purchased	717,300

Recovered_Sheet1

Cash Flow Information - Supplemental - Additional Information (Detail) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Supplemental Cash Flow Elements [Abstract]	'	'
Cash payments made for interest	$9	$7
Net payments made for federal and state income taxes	$20.80	$7.30

Inventories_Stated_at_Lower_of

Inventories Stated at Lower of Average Cost or Market (Detail) (USD $)	Sep. 30, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Inventory Disclosure [Line Items]	'	'
Inventories	$162,094	$156,380
Raw Materials and Material-in-Progress [Member]	'	'
Inventory Disclosure [Line Items]	'	'
Inventories	71,298	56,019
Finished Cement [Member]	'	'
Inventory Disclosure [Line Items]	'	'
Inventories	12,327	18,077
Gypsum Wallboard [Member]	'	'
Inventory Disclosure [Line Items]	'	'
Inventories	6,112	6,855
Aggregates [Member]	'	'
Inventory Disclosure [Line Items]	'	'
Inventories	12,421	16,837
Paperboard [Member]	'	'
Inventory Disclosure [Line Items]	'	'
Inventories	3,412	2,867
Repair Parts and Supplies [Member]	'	'
Inventory Disclosure [Line Items]	'	'
Inventories	51,011	49,361
Fuel and Coal [Member]	'	'
Inventory Disclosure [Line Items]	'	'
Inventories	$5,513	$6,364

Schedule_of_Accrued_Expenses_D

Schedule of Accrued Expenses (Detail) (USD $)	Sep. 30, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Accounts Payable and Accrued Liabilities, Current [Abstract]	'	'
Payroll and Incentive Compensation	$11,145	$11,827
Benefits	9,662	10,349
Interest	4,813	4,813
Property Taxes	4,967	3,235
Power and Fuel	2,539	3,146
Sales and Use Tax	1,129	591
Acquisition Related Expenses	'	2,023
Other	6,530	5,365
Accrued expenses, total	$40,785	$41,349

Recovered_Sheet2

Share-Based Employee Compensation - Additional Information (Detail) (USD $)

3 Months Ended

6 Months Ended

1 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

1 Months Ended

3 Months Ended

6 Months Ended

12 Months Ended

1 Months Ended

In Millions, except Share data, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Aug. 07, 2013

Aug. 07, 2013

Aug. 31, 2013

Aug. 31, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Aug. 31, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Mar. 31, 2013

Mar. 31, 2013

Mar. 31, 2013

Aug. 31, 2013

Stock Awards [Member]

Fiscal 2014 Employee Stock Option Grant [Member]

Fiscal 2014 Board of Directors Grant [Member]

Stock Options [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Minimum [Member]

Maximum [Member]

Board of Directors [Member]

Share Based Employee Compensation [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of shares available for future grant

3,973,459

'

3,973,459

'

3,000,000

1,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of shares granted

'

'

236,989

'

'

'

206,914

30,075

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based compensation vesting period

'

'

'

'

'

'

'3 years

'

'

'

'

'

'

'

'

'

'

'

'5 years

'

'

'

Share-based compensation award expiration term

'

'

'

'

'

'

'10 years

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock option expense

$1.90

$1.30

$2.70

$1.80

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrecognized compensation cost, stock options

'

'

'

'

'

'

'

'

10.3

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted-average period of recognition of unrecognized compensation cost

'

'

'

'

'

'

'

'

'2 years 4 months 24 days

'

'

'

'

'

'

'

'3 years 8 months 12 days

'

'

'

'

'

Aggregate intrinsic value for outstanding options

103.3

'

103.3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate intrinsic value of exercisable options

37.7

'

37.7

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total intrinsic value of options exercised

'

'

2.9

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted stock or unit expense

'

'

'

'

'

'

'

'

'

0

0.4

0

0.8

'

1.2

0.9

2.1

1.6

'

'

'

'

Number of shares granted

'

'

'

'

'

'

'

'

'

'

'

'

'

93,186

'

'

'

'

'

'

'

5,761

Percentage of average return on invested capital

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

15.00%

'

'

Period of average return on invested capital exceeded target

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'10 years

'

'

'

Share-based compensation vesting date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

31-Mar-15

31-Mar-17

'

Unrecognized compensation cost

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$17.70

'

$17.70

'

'

'

'

'

WeightedAverage_Assumptions_Us

Weighted-Average Assumptions Used to Value Option Awards (Detail) (Fiscal 2014 Board of Directors Grant [Member])	9 Months Ended
	Sep. 30, 2013
Fiscal 2014 Board of Directors Grant [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Dividend Yield	2.00%
Expected Volatility	44.60%
Risk Free Interest Rate	2.00%
Expected Life	'7 years

Stock_Option_Activity_Detail

Stock Option Activity (Detail) (USD $)	6 Months Ended
	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Number of Shares, Outstanding Options at Beginning of Period	3,022,592
Number of Shares, Granted	236,989
Number of Shares, Exercised	-70,837
Number of Shares, Cancelled	-5,000
Number of Shares, Outstanding Options at End of Period	3,183,744
Number of Shares, Options Exercisable at End of Period	1,230,175
Weighted-Average Exercise Price, Outstanding Options at Beginning of Period	$37.83
Weighted-Average Exercise Price, Granted	$67.21
Weighted-Average Exercise Price, Exercised	$33.19
Weighted-Average Exercise Price, Cancelled	$53.22
Weighted-Average Exercise Price, Outstanding Options at End of Period	$40.10
Weighted-Average Exercise Price, Options Exercisable at End of Period	$30.68
Weighted-Average Exercise Price, Weighted-Average Fair Value of Options Granted during the Period	'

Stock_Options_Outstanding_Deta

Stock Options Outstanding (Detail) (USD $)	6 Months Ended
	Sep. 30, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Options Outstanding, Number of Shares Outstanding	3,183,744
Options Outstanding, Weighted-Average Remaining Contractual Life	'4 years 1 month 21 days
Options Outstanding, Weighted-Average Exercise Price	$40.10
Options Exercisable, Number of Shares Outstanding	1,230,175
Options Exercisable, Weighted-Average Exercise Price	$30.68
$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	1,006,370
Options Outstanding, Weighted-Average Remaining Contractual Life	'4 years 11 months 23 days
Options Outstanding, Weighted-Average Exercise Price	$26.74
Options Exercisable, Number of Shares Outstanding	886,941
Options Exercisable, Weighted-Average Exercise Price	$26.62
$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	626,719
Options Outstanding, Weighted-Average Remaining Contractual Life	'7 years 5 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$34.57
Options Exercisable, Number of Shares Outstanding	274,993
Options Exercisable, Weighted-Average Exercise Price	$35.34
$47.53 - $ 70.30 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Range of Exercise Prices, Lower Range	$47.53
Range of Exercise Prices, Upper Range	$70.30
Options Outstanding, Number of Shares Outstanding	1,550,655
Options Outstanding, Weighted-Average Remaining Contractual Life	'2 years 3 months 4 days
Options Outstanding, Weighted-Average Exercise Price	$51.01
Options Exercisable, Number of Shares Outstanding	68,241
Options Exercisable, Weighted-Average Exercise Price	$64.76

Calculation_of_Basic_and_Dilut

Calculation of Basic and Diluted Common Shares Outstanding (Detail)	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]	'	'	'	'
Weighted-Average Shares of Common Stock Outstanding	49,012,045	44,746,225	48,984,038	44,708,499
Assumed Exercise of Outstanding Dilutive Options	1,682,592	1,711,195	1,692,782	1,428,889
Less: Shares Repurchased from Assumed Proceeds of Assumed Exercised Options	-1,134,329	-1,371,038	-1,137,668	-1,162,751
Restricted Shares	299,792	267,396	296,230	244,587
Weighted-Average Common and Common Equivalent Shares Outstanding	49,860,100	45,353,778	49,835,382	45,219,224
Shares Excluded Due to Anti-dilution Effects	121,957	1,935,783	71,479	2,126,953

Components_of_Net_Periodic_Cos

Components of Net Periodic Cost (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Compensation And Retirement Disclosure [Abstract]	'	'	'	'
Service Cost - Benefits Earned During the Period	$197	$132	$393	$264
Interest Cost of Benefit Obligations	306	268	611	536
Expected Return on Plan Assets	-343	-342	-686	-684
Recognized Net Actuarial Loss	247	177	492	354
Amortization of Prior-Service Cost	2	14	8	28
Net Periodic Pension Cost	$409	$249	$818	$498

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail)	3 Months Ended	6 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'	'
Effective tax rate	32.00%	32.00%

LongTerm_Debt_Detail

Long-Term Debt (Detail) (USD $)	Sep. 30, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Total	$455,259	$489,259
Credit Facility [Member]	'	'
Debt Instrument [Line Items]	'	'
Total	263,000	297,000
Senior Notes [Member]	'	'
Debt Instrument [Line Items]	'	'
Total	$192,259	$192,259

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Detail) (USD $)

6 Months Ended

6 Months Ended

12 Months Ended

1 Months Ended

1 Months Ended

1 Months Ended

1 Months Ended

6 Months Ended

88 Months Ended

1 Months Ended

6 Months Ended

66 Months Ended

1 Months Ended

Sep. 30, 2013

Mar. 31, 2013

Sep. 30, 2013

Dec. 31, 1998

Sep. 26, 2012

Sep. 30, 2013

Sep. 26, 2012

Dec. 16, 2010

Sep. 30, 2013

Mar. 31, 2013

Sep. 26, 2012

Dec. 16, 2010

Sep. 26, 2012

Dec. 16, 2010

Sep. 26, 2012

Sep. 26, 2012

Sep. 26, 2012

Sep. 26, 2012

Sep. 26, 2012

Sep. 26, 2012

Sep. 30, 2013

Mar. 31, 2013

Nov. 15, 2005

Nov. 30, 2012

Sep. 30, 2013

Mar. 31, 2013

Oct. 02, 2007

Aug. 31, 2011

Industrial Revenue Bonds [Member]

Industrial Revenue Bonds [Member]

Letter Of Credit [Member]

Letter Of Credit [Member]

Credit Facility [Member]

Credit Facility [Member]

Credit Facility [Member]

Credit Facility [Member]

Credit Facility [Member]

Credit Facility [Member]

Credit Facility [Member]

Credit Facility [Member]

Credit Facility [Member]

Credit Facility [Member]

Credit Facility [Member]

Credit Facility [Member]

Credit Facility [Member]

Credit Facility [Member]

2005 Note Purchase Agreement [Member]

2005 Note Purchase Agreement [Member]

2005 Note Purchase Agreement [Member]

2005 Note Purchase Agreement [Member]

2007 Note Purchase Agreement [Member]

2007 Note Purchase Agreement [Member]

2007 Note Purchase Agreement [Member]

Shelf Agreement [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Sub Limit Swing Line Loans [Member]

Sub Limit Swing Line Loans [Member]

Minimum [Member]

Maximum [Member]

Federal Funds Rate [Member]

Federal Funds Rate [Member]

LIBOR [Member]

LIBOR [Member]

Loan

Series 2005A Tranche A [Member]

Loan

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility, principal balance

'

'

'

'

'

'

'

'

'

'

$400,000,000

$300,000,000

$25,000,000

$15,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility, maturity date

'

'

'

'

'

'

'

16-Dec-15

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility, interest rate description

'

'

'

'

'

'

'At the option of the Company, outstanding principal amounts on the 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 Companybs ratio of consolidated EBITDA, defined as earnings before interest, taxes, depreciation and amortization, to the Companybs consolidated indebtedness (the bLeverage Ratiob), 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)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Variable margin

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.00%

1.25%

1.00%

2.25%

'

'

'

'

'

'

'

'

Federal funds rate plus

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.50%

'

'

'

'

'

'

'

'

'

'

Consolidated funded indebtedness ratio

'

'

'

'

'

'

'3.5:1.0 or less and an interest coverage ratio

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest coverage ratio

'

'

'

'

'

'

2.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted payments maximum amount allowed for cash dividend

'

'

'

'

'

'

50,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unused line of credit commitment fee based on leverage ratio

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.10%

0.35%

'

'

'

'

'

'

'

'

'

'

'

'

Borrowings outstanding under Credit Facility

263,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Bank credit facility, borrowings available

129,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted payments maximum consolidated funded indebtedness ratio

'

'

'

'

'

'

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letter of credit facility

'

'

'

'

'

50,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Bank credit facility, one-time fee

'

'

'

'

0.13%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letters of credit outstanding, amount

7,400,000

'

'

'

'

7,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Senior notes, sale

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

200,000,000

'

'

'

200,000,000

'

Number of tranches

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3

'

'

'

4

'

Senior notes, repurchased amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

81,100,000

'

'

'

122,000,000

'

'

Retirement of senior note

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,700,000

'

'

'

'

Senior notes, payment terms

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'Interest for each tranche of Notes is payable semi-annually on the 15thday of May and the 15thday of November of each year until all principal is paid for the respective tranche

'

'

'

'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

'

'

'

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%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from issuance of tax-exempt and taxable industrial revenue bonds

'

'

'

150,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Industrial revenue bonds amount placed in escrow account

'

'

47,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Industrial revenue bonds outstanding

455,259,000

489,259,000

103,000,000

'

'

'

'

'

263,000,000

297,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Remaining amount of industrial revenue bonds transferred in acquisition

'

'

103,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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$75,000,000

Repayment term, years

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Amount_Outstanding_of_Tranches

Amount Outstanding of Tranches - Two Thousand Five Note Purchase Agreement (Detail) (2005 Note Purchase Agreement [Member], USD $)	6 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
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 $)	6 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
Series 2007A Tranche A [Member]	'
Debt Instrument [Line Items]	'
Principal	$9.50
Maturity Date	2-Oct-14
Interest Rate	6.08%
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 $)	6 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
	Segment
Segment Reporting Information [Line Items]	'
Business segments	4
Cement plant locations	6
Cement distribution terminals	16
Gypsum wallboard plants	5
Aggregates processing plant	4
Readymix concrete batch plant	17
Proportionate consolidation of share of Joint Venture's revenues and operating earnings	50.00%
Operating Segments [Member] | Gypsum Wallboard [Member]	'
Segment Reporting Information [Line Items]	'
Carrying value of plant	3
Carrying value of equipment	2.2

Financial_Information_Related_

Financial Information Related to Operations by Segment (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Revenues	$252,646	$164,659	$479,690	$318,701	'
Operating Earnings	69,543	41,305	124,608	70,400	'
Corporate General and Administrative	-6,060	-5,919	-11,654	-10,674	'
Capital Expenditures	10,346	3,943	31,583	8,628	'
Acquisition and Litigation Expense	'	-5,713	'	-6,374	'
Depreciation, Depletion and Amortization	17,403	12,783	34,624	25,444	'
Earnings Before Interest and Income Taxes	63,483	29,673	112,954	53,352	'
Identifiable Assets	1,510,175	'	1,510,175	'	1,476,233
Interest Expense, Net	-4,795	-3,548	-9,750	-7,313	'
Earnings Before Income Taxes	58,688	26,125	103,204	46,039	'
Joint Venture [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Revenues	27,378	23,916	55,782	47,623	'
Cement [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Cement Sales Volume	1,434,000	864,000	2,675,000	1,712,000	'
Cement [Member] | Joint Venture [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Earnings	9,747	8,750	17,625	15,218	'
Cement [Member] | Wholly-Owned Operations [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Earnings	22,683	8,692	33,815	12,090	'
Operating Segments [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Revenues	296,903	201,847	567,953	391,297	'
Operating Segments [Member] | Cement [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Revenues	133,204	78,533	250,904	154,557	'
Operating Earnings	32,430	17,442	51,440	27,308	'
Capital Expenditures	2,069	951	5,836	4,947	'
Depreciation, Depletion and Amortization	7,811	3,924	15,648	7,733	'
Identifiable Assets	759,434	'	759,434	'	756,158
Operating Segments [Member] | Gypsum Wallboard [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Revenues	98,960	77,327	194,941	147,547	'
Operating Earnings	29,868	16,464	59,504	30,486	'
Capital Expenditures	602	1,268	1,699	1,464	'
Depreciation, Depletion and Amortization	5,261	5,269	10,544	10,546	'
Identifiable Assets	415,799	'	415,799	'	425,866
Operating Segments [Member] | Paperboard [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Revenues	34,642	31,730	66,805	62,059	'
Operating Earnings	6,937	7,695	12,616	12,971	'
Capital Expenditures	1,364	145	1,901	366	'
Depreciation, Depletion and Amortization	2,171	2,209	4,353	4,419	'
Identifiable Assets	127,391	'	127,391	'	129,226
Operating Segments [Member] | Concrete and Aggregates [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Revenues	30,097	14,257	55,303	27,134	'
Operating Earnings	-9	-362	148	-161	'
Operating Segments [Member] | Aggregates [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Capital Expenditures	5,468	1,556	21,016	1,791	'
Depreciation, Depletion and Amortization	1,277	896	2,556	1,783	'
Identifiable Assets	146,700	'	146,700	'	108,796
Operating Segments [Member] | Concrete [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Capital Expenditures	843	16	1,131	53	'
Depreciation, Depletion and Amortization	433	268	830	536	'
Identifiable Assets	30,426	'	30,426	'	27,187
Operating Segments [Member] | Corporate and Other [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Depreciation, Depletion and Amortization	450	217	693	427	'
Intersegment Elimination [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Revenues	16,879	13,272	32,481	24,973	'
Intersegment Elimination [Member] | Cement [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Revenues	2,955	512	4,947	1,079	'
Intersegment Elimination [Member] | Paperboard [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Revenues	13,650	12,515	26,862	23,437	'
Intersegment Elimination [Member] | Concrete and Aggregates [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Revenues	274	245	672	457	'
Net Revenue [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Revenues	280,024	188,575	535,472	366,324	'
Reportable Legal Entities [Member] | Cement [Member] | Joint Venture [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Cement Sales Volume	252,000	225,000	514,000	452,000	'
Reportable Legal Entities [Member] | Cement [Member] | Wholly-Owned Operations [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Cement Sales Volume	1,182,000	639,000	2,161,000	1,260,000	'
Significant Reconciling Items [Member] | Other Net [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Operating Earnings	317	66	900	-204	'
Corporate Non Segment [Member] | Corporate and Other [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Capital Expenditures	'	7	'	7	'
Identifiable Assets	$30,425	'	$30,425	'	$29,000

Segment_Breakdown_of_Goodwill_

Segment Breakdown of Goodwill (Detail) (USD $)	Sep. 30, 2013	Mar. 31, 2013
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) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013
Segment Reporting Information [Line Items]	'	'	'	'	'
Current Assets	$300,705	'	$300,705	'	$261,271
Current Liabilities	101,691	'	101,691	'	100,229
Joint Venture [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Revenues	54,756	48,057	111,564	95,944	'
Gross Margin	20,641	18,580	37,335	32,489	'
Earnings Before Income Taxes	19,649	17,501	35,568	30,437	'
Current Assets	52,548	'	52,548	'	53,059
Non-Current Assets	42,691	'	42,691	'	44,120
Current Liabilities	$18,631	'	$18,631	'	$12,913

Interest_Expense_Net_Detail

Interest Expense, Net (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest Income (Expense), Net [Abstract]	'	'	'	'
Interest (Income)	($1)	($3)	($2)	($4)
Interest Expense	4,410	3,342	8,969	6,893
Interest Expense - Income Taxes	163	91	326	188
Other Expenses	223	118	457	236
Interest Expense, net	$4,795	$3,548	$9,750	$7,313

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended
In Millions, unless otherwise specified	Jul. 31, 2010	Jun. 30, 2010	Sep. 30, 2013	Mar. 31, 2010
Commitments And Contingencies Disclosure [Abstract]	'	'	'	'
Contingent liabilities under outstanding letters of credit	'	'	$7.40	'
Contingently liable for performance, current	'	'	16.1	'
Notice of deficiency received for taxes and penalties related to IRS audit	'	71.5	'	'
Notice of deficiency received for taxes and penalties including interest	'	98.7	'	'
Taxes and penalties including interest deposited with IRS	23.7	75	'	'
Notice of deficiency received for taxes and penalties including interest, net outlay	97.9	'	'	'
Taxes and penalties amount refunded from IRS	0.8	'	'	'
Total taxes and penalties including interest deposited with IRS	98.7	'	'	'
Assessment of income tax	'	'	'	8.1
Assessment of penalties	'	'	'	1.9
Income tax interest accrued	'	'	$2.30	'

Fair_Value_of_Senior_Notes_Det

Fair Value of Senior Notes (Detail) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Series 2005A Tranche B [Member]	'
Fair Value of Financial Instruments [Line Items]	'
Fair Value of Senior Notes	$59,897
Series 2005A Tranche C [Member]	'
Fair Value of Financial Instruments [Line Items]	'
Fair Value of Senior Notes	61,047
Series 2007A Tranche A [Member]	'
Fair Value of Financial Instruments [Line Items]	'
Fair Value of Senior Notes	9,814
Series 2007A Tranche B [Member]	'
Fair Value of Financial Instruments [Line Items]	'
Fair Value of Senior Notes	8,684
Series 2007A Tranche C [[Member]	'
Fair Value of Financial Instruments [Line Items]	'
Fair Value of Senior Notes	26,340
Series 2007A Tranche D [Member]	'
Fair Value of Financial Instruments [Line Items]	'
Fair Value of Senior Notes	$40,369