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Schedule of Inventories (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 31, 2018
--- | --- | ---
Inventory [Line Items] |  |
Inventories | $ 275,194 | $ 258,159
Raw Materials and Material-in-Progress [Member] |  |
Inventory [Line Items] |  |
Inventories | 125,828 | 121,628
Finished Cement [Member] |  |
Inventory [Line Items] |  |
Inventories | 27,826 | 24,089
Aggregates [Member] |  |
Inventory [Line Items] |  |
Inventories | 7,351 | 7,787
Gypsum Wallboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 7,124 | 8,477
Paperboard [Member] |  |
Inventory [Line Items] |  |
Inventories | 15,660 | 8,602
Frac Sand [Member] |  |
Inventory [Line Items] |  |
Inventories | 2,557 | 1,696
Repair Parts and Supplies [Member] |  |
Inventory [Line Items] |  |
Inventories | 80,676 | 79,878
Fuel and Coal [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 8,172 | $ 6,002

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