Schedule of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Mar. 31, 2023
Inventory [Line Items]
Inventories	$ 301,374	$ 291,882
Raw Materials and Material-in-Progress [Member]
Inventory [Line Items]
Inventories	96,674	96,880
Finished Cement [Member]
Inventory [Line Items]
Inventories	42,031	46,364
Aggregates [Member]
Inventory [Line Items]
Inventories	10,384	8,309
Gypsum Wallboard [Member]
Inventory [Line Items]
Inventories	5,684	4,244
Recycled Paperboard [Member]
Inventory [Line Items]
Inventories	12,021	8,651
Repair Parts and Supplies [Member]
Inventory [Line Items]
Inventories	115,962	112,885
Fuel and Coal [Member]
Inventory [Line Items]
Inventories	$ 18,618	$ 14,549