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Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Inventory [Line Items]    
Inventories $ 275,194 $ 258,159
Raw Materials and Material-in-Progress [Member]    
Inventory [Line Items]    
Inventories 125,828 121,628
Finished Cement [Member]    
Inventory [Line Items]    
Inventories 27,826 24,089
Aggregates [Member]    
Inventory [Line Items]    
Inventories 7,351 7,787
Gypsum Wallboard [Member]    
Inventory [Line Items]    
Inventories 7,124 8,477
Paperboard [Member]    
Inventory [Line Items]    
Inventories 15,660 8,602
Frac Sand [Member]    
Inventory [Line Items]    
Inventories 2,557 1,696
Repair Parts and Supplies [Member]    
Inventory [Line Items]    
Inventories 80,676 79,878
Fuel and Coal [Member]    
Inventory [Line Items]    
Inventories $ 8,172 $ 6,002