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Schedule of Inventories (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Mar. 31, 2019
--- | --- | ---
Inventory [Line Items] |  |
Inventories | $ 272,508 | $ 275,194
Raw Materials and Material-in-Progress [Member] |  |
Inventory [Line Items] |  |
Inventories | 110,558 | 125,828
Finished Cement [Member] |  |
Inventory [Line Items] |  |
Inventories | 43,538 | 27,826
Aggregates [Member] |  |
Inventory [Line Items] |  |
Inventories | 8,416 | 7,351
Gypsum Wallboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 4,211 | 7,124
Paperboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 5,715 | 15,660
Frac Sand [Member] |  |
Inventory [Line Items] |  |
Inventories | 386 | 2,557
Repair Parts and Supplies [Member] |  |
Inventory [Line Items] |  |
Inventories | 88,095 | 80,676
Fuel and Coal [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 11,589 | $ 8,172

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