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Schedule of Inventories (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Mar. 31, 2018
--- | --- | ---
Inventory [Line Items] |  |
Inventories | $ 241,000 | $ 258,159
Raw Materials and Material-in-Progress [Member] |  |
Inventory [Line Items] |  |
Inventories | 110,487 | 121,628
Finished Cement [Member] |  |
Inventory [Line Items] |  |
Inventories | 26,004 | 24,089
Aggregates [Member] |  |
Inventory [Line Items] |  |
Inventories | 8,083 | 7,787
Gypsum Wallboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 6,588 | 8,477
Paperboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 7,157 | 8,602
Frac Sand [Member] |  |
Inventory [Line Items] |  |
Inventories | 1,785 | 1,696
Repair Parts and Supplies [Member] |  |
Inventory [Line Items] |  |
Inventories | 74,084 | 79,878
Fuel and Coal [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 6,812 | $ 6,002

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