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Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Mar. 31, 2024
--- | --- | ---
Inventory [Line Items] |  |
Inventories | $ 375,602 | $ 373,923
Raw Materials and Material-in-Progress [Member] |  |
Inventory [Line Items] |  |
Inventories | 125,453 | 122,772
Finished Cement [Member] |  |
Inventory [Line Items] |  |
Inventories | 65,720 | 71,396
Aggregates [Member] |  |
Inventory [Line Items] |  |
Inventories | 15,717 | 12,149
Gypsum Wallboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 5,996 | 5,242
Recycled Paperboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 12,359 | 14,278
Repair Parts and Supplies [Member] |  |
Inventory [Line Items] |  |
Inventories | 126,251 | 127,511
Fuel and Coal [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 24,106 | $ 20,575

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