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Schedule of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Inventory [Line Items]
Inventories	$ 203,745	$ 235,749
Raw Materials and Material-in-Progress [Member]
Inventory [Line Items]
Inventories	69,143	92,696
Finished Cement [Member]
Inventory [Line Items]
Inventories	25,628	34,362
Aggregates [Member]
Inventory [Line Items]
Inventories	2,996	2,933
Gypsum Wallboard [Member]
Inventory [Line Items]
Inventories	5,136	4,177
Paperboard [Member]
Inventory [Line Items]
Inventories	4,468	5,031
Repair Parts and Supplies [Member]
Inventory [Line Items]
Inventories	87,385	86,750
Fuel and Coal [Member]
Inventory [Line Items]
Inventories	$ 8,989	$ 9,800

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