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Schedule of Inventories (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Mar. 31, 2015
--- | --- | ---
Inventory [Line Items] |  |
Inventories | $ 224,667 | $ 235,464
Raw Materials and Material-in-Progress [Member] |  |
Inventory [Line Items] |  |
Inventories | 107,698 | 115,345
Finished Cement [Member] |  |
Inventory [Line Items] |  |
Inventories | 18,328 | 20,508
Gypsum Wallboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 7,422 | 7,741
Frac Sand [Member] |  |
Inventory [Line Items] |  |
Inventories | 4,674 | 4,928
Aggregates [Member] |  |
Inventory [Line Items] |  |
Inventories | 10,732 | 11,131
Paperboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 7,669 | 8,493
Repair Parts and Supplies [Member] |  |
Inventory [Line Items] |  |
Inventories | 62,218 | 62,121
Fuel and Coal [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 5,926 | $ 5,197

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