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Schedule of Inventories (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019
--- | --- | ---
Inventory [Line Items] |  |
Inventories | $ 263,612 | $ 275,194
Raw Materials and Material-in-Progress [Member] |  |
Inventory [Line Items] |  |
Inventories | 119,212 | 125,828
Finished Cement [Member] |  |
Inventory [Line Items] |  |
Inventories | 27,000 | 27,826
Aggregates [Member] |  |
Inventory [Line Items] |  |
Inventories | 7,758 | 7,351
Gypsum Wallboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 6,124 | 7,124
Paperboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 13,281 | 15,660
Frac Sand [Member] |  |
Inventory [Line Items] |  |
Inventories | 3,666 | 2,557
Repair Parts and Supplies [Member] |  |
Inventory [Line Items] |  |
Inventories | 77,735 | 80,676
Fuel and Coal [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 8,836 | $ 8,172

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