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Schedule of Inventories (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Mar. 31, 2019
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Inventory [Line Items] |  |
Inventories | $ 241,599 | $ 275,194
Raw Materials and Material-in-Progress [Member] |  |
Inventory [Line Items] |  |
Inventories | 101,904 | 125,828
Finished Cement [Member] |  |
Inventory [Line Items] |  |
Inventories | 22,062 | 27,826
Aggregates [Member] |  |
Inventory [Line Items] |  |
Inventories | 7,228 | 7,351
Gypsum Wallboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 5,587 | 7,124
Paperboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 11,364 | 15,660
Frac Sand [Member] |  |
Inventory [Line Items] |  |
Inventories | 2,913 | 2,557
Repair Parts and Supplies [Member] |  |
Inventory [Line Items] |  |
Inventories | 80,712 | 80,676
Fuel and Coal [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 9,829 | $ 8,172

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