Schedule of Inventories (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Inventory [Line Items]
Inventories	$ 235,749	$ 272,121
Raw Materials and Material-in-Progress [Member]
Inventory [Line Items]
Inventories	92,696	110,558
Finished Cement [Member]
Inventory [Line Items]
Inventories	34,362	43,538
Aggregates [Member]
Inventory [Line Items]
Inventories	2,933	8,416
Gypsum Wallboard [Member]
Inventory [Line Items]
Inventories	4,177	4,211
Paperboard [Member]
Inventory [Line Items]
Inventories	5,031	5,715
Repair Parts and Supplies [Member]
Inventory [Line Items]
Inventories	86,750	88,094
Fuel and Coal [Member]
Inventory [Line Items]
Inventories	$ 9,800	$ 11,589