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Schedule of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Mar. 31, 2018
Inventory [Line Items]
Inventories	$ 251,260	$ 258,159
Raw Materials and Material-in-Progress [Member]
Inventory [Line Items]
Inventories	110,795	121,628
Finished Cement [Member]
Inventory [Line Items]
Inventories	25,062	24,089
Aggregates [Member]
Inventory [Line Items]
Inventories	6,726	7,787
Gypsum Wallboard [Member]
Inventory [Line Items]
Inventories	7,795	8,477
Paperboard [Member]
Inventory [Line Items]
Inventories	14,279	8,602
Frac Sand [Member]
Inventory [Line Items]
Inventories	3,022	1,696
Repair Parts and Supplies [Member]
Inventory [Line Items]
Inventories	77,995	79,878
Fuel and Coal [Member]
Inventory [Line Items]
Inventories	$ 5,586	$ 6,002

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
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