Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Mar. 31, 2025 |
|---|---|---|
| Inventory [Line Items] | ||
| Inventories | $ 384,879 | $ 415,175 |
| Raw Materials and Material-in-Progress [Member] | ||
| Inventory [Line Items] | ||
| Inventories | 140,917 | 164,683 |
| Finished Cement [Member] | ||
| Inventory [Line Items] | ||
| Inventories | 57,604 | 67,711 |
| Aggregates [Member] | ||
| Inventory [Line Items] | ||
| Inventories | 13,839 | 17,681 |
| Gypsum Wallboard [Member] | ||
| Inventory [Line Items] | ||
| Inventories | 5,958 | 5,708 |
| Recycled Paperboard [Member] | ||
| Inventory [Line Items] | ||
| Inventories | 12,434 | 7,814 |
| Repair Parts and Supplies [Member] | ||
| Inventory [Line Items] | ||
| Inventories | 135,032 | 126,983 |
| Fuel and Coal [Member] | ||
| Inventory [Line Items] | ||
| Inventories | $ 19,095 | $ 24,595 |