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Financial Information Related to Operations by Segment (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017 USD ($) kT	Sep. 30, 2016 USD ($) kT	Sep. 30, 2017 USD ($) kT	Sep. 30, 2016 USD ($) kT	Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Revenues	$ 376,315	$ 332,658	$ 742,436	$ 630,162
Net Revenues, including Joint Venture	402,315	359,633	796,606	682,025
Less: Joint Venture	(26,000)	(26,975)	(54,170)	(51,863)
Operating Earnings	108,709	103,357	204,644	183,292
Corporate General and Administrative	(9,821)	(8,832)	(19,500)	(18,665)
Other Income	887	504	1,644	1,579
Earnings Before Interest and Income Taxes	99,775	95,029	186,788	166,206
Interest Expense, Net	(7,456)	(5,656)	(14,939)	(9,557)
Earnings Before Income Taxes	92,319	89,373	171,849	156,649
Capital Expenditures	33,931	9,253	50,091	18,231
Depreciation, Depletion and Amortization	30,306	22,386	59,253	45,249
Identifiable Assets	2,321,041		2,321,041		$ 2,247,124
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	425,530	379,964	842,520	720,680
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(23,215)	(20,331)	(45,914)	(38,655)
Cement [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	$ 191,650	$ 166,811	$ 374,585	$ 311,603
Cement Sales Volume | kT	1,570	1,442	3,081	2,693
Operating Earnings	$ 58,752	$ 50,716	$ 101,933	$ 82,316
Capital Expenditures	13,014	5,009	20,732	10,254
Depreciation, Depletion and Amortization	12,662	$ 8,784	25,141	$ 17,395
Identifiable Assets	$ 1,244,725		$ 1,244,725		1,234,617
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume | kT	227	242	470	460
Operating Earnings	$ 11,955	$ 12,147	$ 21,831	$ 20,127
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume | kT	1,343	1,200	2,611	2,233
Operating Earnings	$ 46,797	$ 38,569	$ 80,102	$ 62,189
Cement [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(4,654)	(4,536)	(9,583)	(8,071)
Gypsum Wallboard [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	123,068	122,923	249,881	236,185
Operating Earnings	39,575	41,698	83,396	81,034
Capital Expenditures	5,219	2,097	10,861	3,425
Depreciation, Depletion and Amortization	4,473	4,768	8,915	9,530
Identifiable Assets	378,927		378,927		379,414
Paperboard [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	45,359	44,459	89,772	87,274
Operating Earnings	6,517	10,220	11,455	21,447
Capital Expenditures	659	400	1,423	1,704
Depreciation, Depletion and Amortization	2,172	2,106	4,309	4,206
Identifiable Assets	123,527		123,527		124,356
Paperboard [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(18,159)	(15,452)	(35,516)	(29,958)
Oil and Gas Proppants [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	22,022	6,631	40,932	11,727
Operating Earnings	(1,754)	(4,090)	(3,780)	(10,002)
Capital Expenditures	13,781	8	14,360	65
Depreciation, Depletion and Amortization	8,518	4,261	16,124	9,445
Identifiable Assets	380,838		380,838		376,306
Concrete and Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	43,431	39,140	87,350	73,891
Operating Earnings	5,619	4,813	11,640	8,497
Capital Expenditures	1,118	1,506	2,530	2,550
Depreciation, Depletion and Amortization	1,929	1,920	3,844	3,669
Identifiable Assets	107,831		107,831		110,413
Concrete and Aggregates [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(402)	(343)	(815)	(626)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	140	233	185	233
Depreciation, Depletion and Amortization	552	$ 547	920	$ 1,004
Identifiable Assets	$ 85,193		$ 85,193		$ 22,018

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