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Schedule of Inventories (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Mar. 31, 2020
--- | --- | ---
Inventory [Line Items] |  |
Inventories | $ 227,106 | $ 272,121
Raw Materials and Materials-in-Progress [Member] |  |
Inventory [Line Items] |  |
Inventories | 84,494 | 110,558
Finished Cement [Member] |  |
Inventory [Line Items] |  |
Inventories | 28,866 | 43,538
Aggregates [Member] |  |
Inventory [Line Items] |  |
Inventories | 3,544 | 8,416
Gypsum Wallboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 4,015 | 4,211
Paperboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 4,887 | 5,715
Repair Parts and Supplies [Member] |  |
Inventory [Line Items] |  |
Inventories | 89,177 | 88,094
Fuel and Coal [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 12,123 | $ 11,589

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