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Financial Information Related to Operations by Segment (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016 USD ($) T	Sep. 30, 2015 USD ($) T	Sep. 30, 2016 USD ($) T	Sep. 30, 2015 USD ($) T	Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Net Revenues	$ 332,658	$ 328,988	$ 630,162	$ 613,951
Net Revenues, including Joint Venture	359,633	358,524	682,025	670,498
Less: Joint Venture	(26,975)	(29,536)	(51,863)	(56,547)
Operating Earnings	103,861	56,546	184,871	125,908
Corporate General and Administrative	(8,832)	(9,364)	(18,665)	(18,355)
Earnings Before Interest and Income Taxes	95,029	47,182	166,206	107,553
Interest Expense, Net	(5,656)	(4,342)	(9,557)	(8,828)
Earnings Before Income Taxes	89,373	42,840	156,649	98,725
Capital Expenditures	9,253	28,747	18,231	55,869
Depreciation, Depletion and Amortization	22,386	24,770	45,249	49,034
Identifiable Assets	1,908,135		1,908,135		$ 1,883,635
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Revenues	379,964	378,614	720,680	708,517
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net Revenues	(20,331)	(20,090)	(38,655)	(38,019)
Other, net [Member]
Segment Reporting Information [Line Items]
Operating Earnings	504	572	1,579	1,007
Capital Expenditures	233		233
Depreciation, Depletion and Amortization	547	489	1,004	984
Cement [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Revenues	$ 166,811	$ 164,790	$ 311,603	$ 292,966
Cement Sales Volume | T	1,442	1,484	2,693	2,687
Operating Earnings	$ 50,716	$ 48,577	$ 82,316	$ 74,290
Capital Expenditures	5,009	5,349	10,254	13,499
Depreciation, Depletion and Amortization	8,784	$ 8,629	17,395	$ 16,495
Identifiable Assets	$ 833,219		$ 833,219		819,994
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume | T	1,200	1,248	2,233	2,239
Operating Earnings	$ 38,569	$ 36,897	$ 62,189	$ 54,780
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume | T	242	236	460	448
Operating Earnings	$ 12,147	$ 11,680	$ 20,127	$ 19,510
Cement [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net Revenues	(4,536)	(4,232)	(8,071)	(7,358)
Gypsum Wallboard [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Revenues	122,923	119,701	236,185	234,753
Operating Earnings	41,698	40,002	81,034	80,896
Capital Expenditures	2,097	203	3,425	1,700
Depreciation, Depletion and Amortization	4,768	4,819	9,530	9,605
Identifiable Assets	378,905		378,905		392,523
Paperboard [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Revenues	44,459	39,145	87,274	74,463
Operating Earnings	10,220	8,138	21,447	14,168
Capital Expenditures	400	2,424	1,704	3,268
Depreciation, Depletion and Amortization	2,106	2,063	4,206	4,116
Identifiable Assets	123,124		123,124		127,371
Paperboard [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net Revenues	(15,452)	(15,596)	(29,958)	(30,147)
Oil and Gas Proppants [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Revenues	6,631	18,307	11,727	41,132
Operating Earnings	(4,090)	(44,600)	(10,002)	(50,236)
Capital Expenditures	8	16,744	65	32,711
Depreciation, Depletion and Amortization	4,261	7,205	9,445	14,764
Identifiable Assets	390,915		390,915		409,497
Concrete and Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Revenues	39,140	36,671	73,891	65,203
Operating Earnings	4,813	3,857	8,497	5,783
Capital Expenditures	1,506	4,027	2,550	4,691
Depreciation, Depletion and Amortization	1,920	1,565	3,669	3,070
Identifiable Assets	109,683		109,683		106,634
Concrete and Aggregates [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net Revenues	(343)	$ (262)	(626)	$ (514)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	$ 72,289		$ 72,289		$ 27,616

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