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Financial Information Related to Operations by Segment (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020 USD ($) kT	Sep. 30, 2019 USD ($) kT	Sep. 30, 2020 USD ($) kT	Sep. 30, 2019 USD ($) kT	Mar. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Revenue	$ 447,684	$ 400,569	$ 874,673	$ 755,934
Less: Joint Venture Revenue	(27,193)	(29,888)	(52,493)	(57,393)
Operating Earnings	133,426	121,377	243,519	208,903
Other		(955)		(1,860)
Corporate General and Administrative Expense	(11,109)	(13,458)	(28,898)	(34,712)
Gain on Sale of Businesses			51,973
Other Non-Operating Income (Loss)	(90)	585	(399)	723
Earnings Before Interest and Income Taxes	122,227	108,504	266,195	174,914
Interest Expense, Net	(12,556)	(10,137)	(26,597)	(18,983)
Earnings from Continuing Operations Before Income Taxes	109,671	98,367	239,598	155,931
Capital Expenditures	14,685	37,387	40,676	62,810
Depreciation, Depletion and Amortization			64,199	56,333
Capital Expenditures				65
Depreciation and Amortization	100	3,803	221	7,642
Identifiable Assets	2,871,283		2,871,283		$ 2,961,020
Assets of Discontinued Operations					13,831
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	501,643	453,491	974,138	858,006
Operating Earnings	79,913	66,526	140,368	102,647
Depreciation, Depletion and Amortization	32,162	24,570	63,978	48,691
Operating Segments [Member] | Wholly-Owned [Member]
Segment Reporting Information [Line Items]
Operating Earnings	69,336	54,169	121,995	80,858
Operating Segments [Member] | Joint Venture [Member]
Segment Reporting Information [Line Items]
Operating Earnings	10,577	12,357	18,373	21,789
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(26,766)	(23,034)	(46,972)	(44,679)
Revenue	(26,766)	(23,034)	(46,972)	(44,679)
Other, net [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	259,212		259,212		271,608
Cement [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	$ 278,062	$ 227,013	$ 539,473	$ 422,326
Cement Sales Volume | kT	2,180	1,778	4,265	3,328
Operating Earnings	$ 79,913	$ 66,526	$ 140,368	$ 102,647
Capital Expenditures	7,909	8,209	18,257	18,746
Depreciation, Depletion and Amortization	19,258	$ 13,868	38,501	$ 28,086
Identifiable Assets	$ 1,952,280		$ 1,952,280		1,980,306
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume | kT	1,947	1,529	3,813	2,847
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume | kT	233	249	452	481
Cement [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	$ (6,267)	$ (6,703)	$ (12,298)	$ (10,956)
Concrete and Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	46,300	55,971	90,490	95,749
Operating Earnings	5,255	7,255	10,673	11,689
Capital Expenditures	41	5,496	1,302	6,091
Depreciation, Depletion and Amortization	2,698	2,754	5,419	4,945
Identifiable Assets	96,566		96,566		136,041
Concrete and Aggregates [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue		(407)	(106)	(784)
Gypsum Wallboard [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	131,210	128,660	261,360	255,384
Operating Earnings	37,606	38,456	78,931	76,388
Capital Expenditures	4,070	6,443	10,582	8,374
Depreciation, Depletion and Amortization	5,661	5,147	10,861	10,099
Identifiable Assets	369,966		369,966		375,946
Paperboard [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	46,071	41,847	82,815	84,547
Operating Earnings	10,652	10,095	13,547	20,039
Capital Expenditures	2,665	17,239	10,535	29,599
Depreciation, Depletion and Amortization	3,344	2,203	6,696	4,366
Identifiable Assets	193,259		193,259		$ 183,288
Paperboard [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(20,499)	(15,924)	(34,568)	(32,939)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	$ 1,201	$ 598	$ 2,501	$ 1,195

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