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Schedule of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Mar. 31, 2019
Inventory [Line Items]
Inventories	$ 234,264	$ 275,194
Raw Materials and Material-in-Progress [Member]
Inventory [Line Items]
Inventories	93,865	125,828
Finished Cement [Member]
Inventory [Line Items]
Inventories	24,673	27,826
Aggregates [Member]
Inventory [Line Items]
Inventories	7,588	7,351
Gypsum Wallboard [Member]
Inventory [Line Items]
Inventories	4,881	7,124
Paperboard [Member]
Inventory [Line Items]
Inventories	11,638	15,660
Frac Sand [Member]
Inventory [Line Items]
Inventories	529	2,557
Repair Parts and Supplies [Member]
Inventory [Line Items]
Inventories	81,445	80,676
Fuel and Coal [Member]
Inventory [Line Items]
Inventories	$ 9,645	$ 8,172

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