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Financial Information Related to Operations by Segment (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018 USD ($) kT	Sep. 30, 2017 USD ($) kT	Sep. 30, 2018 USD ($) kT	Sep. 30, 2017 USD ($) kT	Mar. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Revenue	$ 381,499	$ 376,315	$ 775,255	$ 742,436
Less: Joint Venture Revenue	(25,479)	(26,000)	(52,743)	(54,170)
Operating Earnings	108,104	108,709	208,989	204,644
Corporate General and Administrative Expense	(9,922)	(9,821)	(17,925)	(19,500)
Litigation Settlements and Losses			(1,800)
Other Non-Operating Income	428	887	999	1,644
Earnings Before Interest and Income Taxes	98,610	99,775	190,263	186,788
Interest Expense, Net	(6,817)	(7,456)	(13,449)	(14,939)
Earnings before Income Taxes	91,793	92,319	176,814	171,849
Capital Expenditures	40,371	33,931	93,444	50,091
Depreciation, Depletion and Amortization	32,326	30,306	62,176	59,253
Identifiable Assets	2,379,512		2,379,512		$ 2,368,003
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	427,257	425,530	870,133	842,520
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(20,279)	(23,215)	(42,135)	(45,914)
Other [Member]
Segment Reporting Information [Line Items]
Operating Earnings	98		382
Capital Expenditures	1,396	140	1,736	185
Identifiable Assets	66,527		66,527		104,367
Cement [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	$ 193,161	$ 191,650	$ 379,949	$ 374,585
Cement Sales Volume | kT	1,557	1,570	3,068	3,081
Operating Earnings	$ 57,547	$ 58,752	$ 94,881	$ 101,933
Capital Expenditures	14,220	13,014	33,833	20,732
Depreciation, Depletion and Amortization	12,746	$ 12,662	25,667	$ 25,141
Identifiable Assets	$ 1,274,535		$ 1,274,535		1,247,504
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume | kT	1,339	1,343	2,614	2,611
Operating Earnings	$ 47,374	$ 46,797	$ 75,457	$ 80,102
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume | kT	218	227	454	470
Operating Earnings	$ 10,173	$ 11,955	$ 19,424	$ 21,831
Cement [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(4,073)	(4,654)	(8,251)	(9,583)
Concrete and Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	39,744	43,431	80,584	87,350
Operating Earnings	4,100	5,619	9,584	11,640
Capital Expenditures	459	1,118	2,523	2,530
Depreciation, Depletion and Amortization	2,052	1,929	4,105	3,844
Identifiable Assets	104,166		104,166		104,851
Concrete and Aggregates [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(501)	(402)	(832)	(815)
Gypsum Wallboard [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	129,609	123,068	272,024	249,881
Operating Earnings	45,671	39,575	96,151	83,396
Capital Expenditures	4,124	5,219	6,479	10,861
Depreciation, Depletion and Amortization	5,201	4,473	10,031	8,915
Identifiable Assets	378,902		378,902		386,041
Paperboard [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	41,277	45,359	86,410	89,772
Operating Earnings	8,609	6,517	18,603	11,455
Capital Expenditures	5,345	659	6,410	1,423
Depreciation, Depletion and Amortization	2,128	2,172	4,237	4,309
Identifiable Assets	127,026		127,026		123,819
Paperboard [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(15,705)	(18,159)	(33,052)	(35,516)
Oil and Gas Proppants [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	19,080	22,022	40,838	40,932
Operating Earnings	(7,921)	(1,754)	(10,612)	(3,780)
Capital Expenditures	14,827	13,781	42,463	14,360
Depreciation, Depletion and Amortization	9,398	8,518	16,537	16,124
Identifiable Assets	428,356		428,356		$ 401,421
Other [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	4,386		10,328
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	$ 801	$ 552	$ 1,599	$ 920

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