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Schedule of Inventories (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | ---
Inventory [Line Items] |  |
Inventories | $ 222,783 | $ 243,595
Raw Materials and Material-in-Progress [Member] |  |
Inventory [Line Items] |  |
Inventories | 104,173 | 119,060
Finished Cement [Member] |  |
Inventory [Line Items] |  |
Inventories | 18,963 | 21,834
Gypsum Wallboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 6,944 | 5,839
Frac Sand [Member] |  |
Inventory [Line Items] |  |
Inventories | 3,847 | 5,501
Aggregates [Member] |  |
Inventory [Line Items] |  |
Inventories | 7,510 | 10,660
Paperboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 4,818 | 7,575
Repair Parts and Supplies [Member] |  |
Inventory [Line Items] |  |
Inventories | 70,986 | 68,155
Fuel and Coal [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 5,542 | $ 4,971

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