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Financial Information Related to Operations by Segment (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018 USD ($) kT	Dec. 31, 2017 USD ($) kT	Dec. 31, 2018 USD ($) kT	Dec. 31, 2017 USD ($) kT	Mar. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Revenue	$ 333,285	$ 359,371	$ 1,108,540	$ 1,101,807
Less: Joint Venture Revenue	(25,369)	(25,526)	(78,112)	(79,696)
Operating Earnings	89,928	105,938	298,917	310,582
Corporate General and Administrative Expense	(9,408)	(9,883)	(27,333)	(29,383)
Litigation Settlements and Losses		(39,098)	(1,800)	(39,098)
Other Non-Operating Income	1,292	1,084	2,291	2,728
Earnings Before Interest and Income Taxes	81,812	58,041	272,075	244,829
Interest Expense, Net	(7,294)	(6,653)	(20,743)	(21,592)
Earnings before Income Taxes	74,518	51,388	251,332	223,237
Capital Expenditures	33,002	33,607	126,446	83,698
Depreciation, Depletion and Amortization	29,785	28,650	91,961	87,903
Identifiable Assets	2,355,416		2,355,416		$ 2,368,003
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	379,265	408,472	1,249,398	1,250,992
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(20,611)	(23,575)	(62,746)	(69,489)
Other [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	3,690	50	5,023	235
Identifiable Assets	32,158		32,158		60,962
Cement [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	$ 163,732	$ 161,601	$ 543,681	$ 536,186
Cement Sales Volume | kT	1,344	1,339	4,412	4,420
Operating Earnings	$ 47,197	$ 52,523	$ 142,078	$ 154,456
Capital Expenditures	17,691	11,012	51,524	31,744
Depreciation, Depletion and Amortization	13,242	$ 13,117	38,909	$ 38,258
Identifiable Assets	$ 1,262,380		$ 1,262,380		1,247,504
Cement [Member] | Operating Segments [Member] | Wholly-Owned [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume | kT	1,126	1,123	3,740	3,734
Operating Earnings	$ 37,690	$ 41,151	$ 113,147	$ 121,253
Cement [Member] | Operating Segments [Member] | Joint Venture [Member]
Segment Reporting Information [Line Items]
Cement Sales Volume | kT	218	216	672	686
Operating Earnings	$ 9,507	$ 11,372	$ 28,931	$ 33,203
Cement [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(3,518)	(4,160)	(11,769)	(13,743)
Concrete and Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	30,841	38,742	111,425	126,092
Operating Earnings	1,037	3,414	10,621	15,054
Capital Expenditures	2,263	2,446	4,786	4,976
Depreciation, Depletion and Amortization	2,049	2,007	6,154	5,851
Identifiable Assets	98,552		98,552		104,851
Concrete and Aggregates [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(346)	(288)	(1,178)	(1,103)
Gypsum Wallboard [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	130,954	133,348	402,978	383,229
Operating Earnings	43,543	39,841	139,694	123,237
Capital Expenditures	2,054	4,616	8,533	15,477
Depreciation, Depletion and Amortization	4,978	4,599	15,009	13,514
Identifiable Assets	370,633		370,633		386,041
Paperboard [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	39,638	48,389	126,048	138,161
Operating Earnings	7,475	10,903	26,078	22,358
Capital Expenditures	1,486	1,490	7,896	2,913
Depreciation, Depletion and Amortization	2,150	2,204	6,387	6,513
Identifiable Assets	129,366		129,366		123,819
Paperboard [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(16,747)	(19,127)	(49,799)	(54,643)
Oil and Gas Proppants [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	14,100	26,392	65,266	67,324
Operating Earnings	(9,324)	(743)	(19,554)	(4,523)
Capital Expenditures	5,818	13,993	48,684	28,353
Depreciation, Depletion and Amortization	6,964	6,370	24,403	22,682
Identifiable Assets	462,327		462,327		$ 444,826
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	$ 402	$ 353	$ 1,099	$ 1,085

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