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Financial Information Related to Operations by Segment (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2021 USD ($) kt	Dec. 31, 2020 USD ($) kt	Dec. 31, 2021 USD ($) kt	Dec. 31, 2020 USD ($) kt	Mar. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Revenue	$ 462,941	$ 404,667	$ 1,448,405	$ 1,279,340
Less: Joint Venture Revenue	(27,406)	(27,110)	(77,023)	(79,603)
Operating Earnings	147,141	123,462	445,223	366,981
Corporate General and Administrative Expense	(12,851)	(11,327)	(32,986)	(40,225)
Early Retirement of Senior Notes	0		(8,407)
Gain on Sale of Businesses				51,973
Other Non-Operating Income (Loss)	3,207	2,297	5,941	1,898
Earnings Before Interest and Income Taxes	137,497	114,432	409,771	380,627
Interest Expense, net	(5,651)	(9,360)	(24,891)	(35,957)
Earnings from Continuing Operations Before Income Taxes	131,846	105,072	384,880	344,670
Capital Expenditures	28,411	4,865	55,188	45,541
Depreciation, Depletion and Amortization			96,478	96,279
Depreciation and Amortization	0	0	0	221
Identifiable Assets	2,560,121		2,560,121		$ 2,838,681
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	516,886	452,882	1,603,286	1,427,020
Depreciation, Depletion and Amortization	32,194	32,080	96,478	96,058
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	26,539	21,105	77,858	68,077
Revenue	26,539	21,105	77,858	68,077
Cement [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	$ 261,155	$ 234,092	$ 819,734	$ 773,565
Cement Sales Volume | kt	1,963	1,842	6,197	6,107
Operating Earnings	$ 79,836	$ 70,434	$ 231,133	$ 210,802
Capital Expenditures	8,256	2,510	23,199	20,767
Depreciation, Depletion and Amortization	19,933	$ 19,337	59,483	$ 57,838
Identifiable Assets	$ 1,861,439		$ 1,861,439		1,898,930
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume | kt	1,748	1,616	5,583	5,429
Operating Earnings	$ 71,281	$ 60,351	$ 206,348	$ 182,346
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume | kt	215	226	614	678
Operating Earnings	$ 8,555	$ 10,083	$ 24,785	$ 28,456
Cement [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(5,301)	5,241	(18,357)	(17,539)
Concrete and Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	42,384	43,530	139,888	134,020
Operating Earnings	4,115	5,075	16,998	15,748
Capital Expenditures	2,386	1,631	3,459	2,933
Depreciation, Depletion and Amortization	2,294	2,691	7,342	8,110
Identifiable Assets	88,277		88,277		88,410
Concrete and Aggregates [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue				(106)
Gypsum Wallboard [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	163,584	135,658	502,836	397,018
Operating Earnings	60,841	40,792	190,425	119,723
Capital Expenditures	16,222	491	24,261	11,073
Depreciation, Depletion and Amortization	5,598	5,340	16,478	16,201
Identifiable Assets	387,309		387,309		366,352
Paperboard [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	49,763	39,602	140,828	122,417
Operating Earnings	2,349	7,161	6,667	20,708
Capital Expenditures	594	233	2,086	10,768
Depreciation, Depletion and Amortization	3,685	3,509	11,016	10,205
Identifiable Assets	183,755		183,755		186,156
Paperboard [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(21,238)	(15,864)	(59,501)	(50,432)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	953		2,183
Depreciation, Depletion and Amortization	684	$ 1,203	2,159	$ 3,704
Other, net [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	$ 39,341		$ 39,341		$ 298,833

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