Schedule of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Mar. 31, 2023
Inventory [Line Items]
Inventories	$ 333,828	$ 291,882
Raw Materials and Material-in-Progress [Member]
Inventory [Line Items]
Inventories	104,465	96,880
Finished Cement [Member]
Inventory [Line Items]
Inventories	55,480	46,364
Aggregates [Member]
Inventory [Line Items]
Inventories	10,580	8,309
Gypsum Wallboard [Member]
Inventory [Line Items]
Inventories	7,183	4,244
Recycled Paperboard [Member]
Inventory [Line Items]
Inventories	13,471	8,651
Repair Parts and Supplies [Member]
Inventory [Line Items]
Inventories	123,555	112,885
Fuel and Coal [Member]
Inventory [Line Items]
Inventories	$ 19,094	$ 14,549