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Segment Information - Segment Breakdown of Goodwill (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Goodwill | $ 398,329 | $ 392,569
Cement [Member] |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 227,639 | 227,639
Concrete and Aggregates [Member] |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 46,534 | 40,774
Gypsum Wallboard [Member] |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 116,618 | 116,618
Recycled Paperboard [Member] |  |
Segment Reporting Information [Line Items] |  |
Goodwill | $ 7,538 | $ 7,538

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