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Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | ---
Inventory [Line Items] |  |
Inventories | $ 392,266 | $ 373,923
Raw Materials and Material-in-Progress [Member] |  |
Inventory [Line Items] |  |
Inventories | 140,568 | 122,772
Finished Cement [Member] |  |
Inventory [Line Items] |  |
Inventories | 65,839 | 71,396
Aggregates [Member] |  |
Inventory [Line Items] |  |
Inventories | 16,676 | 12,149
Gypsum Wallboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 6,747 | 5,242
Recycled Paperboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 9,401 | 14,278
Repair Parts and Supplies [Member] |  |
Inventory [Line Items] |  |
Inventories | 128,584 | 127,511
Fuel and Coal [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 24,451 | $ 20,575

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