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Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Inventory [Line Items]    
Inventories $ 263,612 $ 275,194
Raw Materials and Material-in-Progress [Member]    
Inventory [Line Items]    
Inventories 119,212 125,828
Finished Cement [Member]    
Inventory [Line Items]    
Inventories 27,000 27,826
Aggregates [Member]    
Inventory [Line Items]    
Inventories 7,758 7,351
Gypsum Wallboard [Member]    
Inventory [Line Items]    
Inventories 6,124 7,124
Paperboard [Member]    
Inventory [Line Items]    
Inventories 13,281 15,660
Frac Sand [Member]    
Inventory [Line Items]    
Inventories 3,666 2,557
Repair Parts and Supplies [Member]    
Inventory [Line Items]    
Inventories 77,735 80,676
Fuel and Coal [Member]    
Inventory [Line Items]    
Inventories $ 8,836 $ 8,172