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Financial Information Related to Operations by Segment (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020 USD ($) kT	Dec. 31, 2019 USD ($) kT	Dec. 31, 2020 USD ($) kT	Dec. 31, 2019 USD ($) kT	Mar. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Revenue	$ 404,667	$ 342,904	$ 1,279,340	$ 1,098,838
Less: Joint Venture Revenue	(27,110)	(28,382)	(79,603)	(85,775)
Operating Earnings	123,462	103,903	366,981	312,806
Other		(1,116)		(2,976)
Corporate General and Administrative Expense	(11,327)	(13,794)	(40,225)	(48,506)
Gain on Sale of Businesses			51,973
Impairment Losses		(25,131)		(25,131)
Other Non-Operating Income	2,297	722	1,898	1,445
Earnings Before Interest and Income Taxes	114,432	65,700	380,627	240,614
Interest Expense, Net	(9,360)	(9,543)	(35,957)	(28,526)
Earnings from Continuing Operations Before Income Taxes	105,072	56,157	344,670	212,088
Capital Expenditures	4,865	23,770	45,541	86,580
Depreciation, Depletion and Amortization			96,279	84,944
Capital Expenditures		86		151
Depreciation and Amortization		3,445	221	11,087
Identifiable Assets	2,725,038		2,725,038		$ 2,961,020
Assets of Discontinued Operations					13,831
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	452,882	393,061	1,427,020	1,251,067
Depreciation, Depletion and Amortization	32,080	25,166	96,058	73,857
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(21,105)	(21,775)	(68,077)	(66,454)
Revenue	(21,105)	(21,775)	(68,077)	(66,454)
Other, net [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	169,798		169,798		271,608
Cement [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	$ 234,092	$ 183,031	$ 773,565	$ 605,357
Cement Sales Volume | kT	1,842	1,439	6,107	4,767
Operating Earnings	$ 70,434	$ 54,180	$ 210,802	$ 156,827
Capital Expenditures	2,510	7,379	20,767	26,125
Depreciation, Depletion and Amortization	19,337	$ 14,189	57,838	$ 42,275
Identifiable Assets	$ 1,907,191		$ 1,907,191		1,980,306
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume | kT	1,616	1,199	5,429	4,046
Operating Earnings	$ 60,351	$ 43,480	$ 182,346	$ 124,338
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume | kT	226	240	678	721
Operating Earnings	$ 10,083	$ 10,700	$ 28,456	$ 32,489
Cement [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(5,241)	(6,174)	(17,539)	(17,130)
Concrete and Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	43,530	47,147	134,020	142,896
Operating Earnings	5,075	3,334	15,748	15,023
Capital Expenditures	1,631	3,233	2,933	9,324
Depreciation, Depletion and Amortization	2,691	3,105	8,110	8,050
Identifiable Assets	99,495		99,495		136,041
Concrete and Aggregates [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue		(350)	(106)	(1,134)
Gypsum Wallboard [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	135,658	125,070	397,018	380,454
Operating Earnings	40,792	38,484	119,723	114,872
Capital Expenditures	491	273	11,073	8,647
Depreciation, Depletion and Amortization	5,340	5,050	16,201	15,149
Identifiable Assets	358,530		358,530		375,946
Paperboard [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	39,602	37,813	122,417	122,360
Operating Earnings	7,161	9,021	20,708	29,060
Capital Expenditures	233	12,885	10,768	42,484
Depreciation, Depletion and Amortization	3,509	2,244	10,205	6,610
Identifiable Assets	190,024		190,024		$ 183,288
Paperboard [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(15,864)	(15,251)	(50,432)	(48,190)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	$ 1,203	$ 578	$ 3,704	$ 1,773

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