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Schedule of Inventories (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Mar. 31, 2016
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Inventory [Line Items] |  |
Inventories | $ 217,582 | $ 243,595
Raw Materials and Material-in-Progress [Member] |  |
Inventory [Line Items] |  |
Inventories | 104,759 | 119,060
Finished Cement [Member] |  |
Inventory [Line Items] |  |
Inventories | 17,096 | 21,834
Gypsum Wallboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 5,939 | 5,839
Frac Sand [Member] |  |
Inventory [Line Items] |  |
Inventories | 3,375 | 5,501
Aggregates [Member] |  |
Inventory [Line Items] |  |
Inventories | 8,387 | 10,660
Paperboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 3,647 | 7,575
Repair Parts and Supplies [Member] |  |
Inventory [Line Items] |  |
Inventories | 68,777 | 68,155
Fuel and Coal [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 5,602 | $ 4,971

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