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Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Inventory [Line Items] |  |
Inventories | $ 393,401 | $ 415,175
Raw Materials and Material-in-Progress [Member] |  |
Inventory [Line Items] |  |
Inventories | 151,324 | 164,683
Finished Cement [Member] |  |
Inventory [Line Items] |  |
Inventories | 63,249 | 67,711
Aggregates [Member] |  |
Inventory [Line Items] |  |
Inventories | 16,371 | 17,681
Gypsum Wallboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 6,087 | 5,708
Recycled Paperboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 7,124 | 7,814
Repair Parts and Supplies [Member] |  |
Inventory [Line Items] |  |
Inventories | 125,182 | 126,983
Fuel and Coal [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 24,064 | $ 24,595

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