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Schedule of Inventories (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Mar. 31, 2017
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Inventory [Line Items] |  |
Inventories | $ 239,189 | $ 252,846
Raw Materials and Material-in-Progress [Member] |  |
Inventory [Line Items] |  |
Inventories | 111,355 | 122,736
Finished Cement [Member] |  |
Inventory [Line Items] |  |
Inventories | 22,185 | 24,428
Gypsum Wallboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 7,668 | 7,951
Paperboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 8,738 | 8,635
Frac Sand [Member] |  |
Inventory [Line Items] |  |
Inventories | 2,239 | 2,907
Aggregates [Member] |  |
Inventory [Line Items] |  |
Inventories | 7,553 | 7,686
Repair Parts and Supplies [Member] |  |
Inventory [Line Items] |  |
Inventories | 73,851 | 73,732
Fuel and Coal [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 5,600 | $ 4,771

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