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Business Segments - Additional Information (Detail) $ in Millions |  | 12 Months Ended
--- | --- | ---
May 01, 2024 USD ($) | Mar. 31, 2025 Location Facility Plant Terminal Segment Sector
Segment Reporting Information [Line Items] |  |
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] |  | srt:ChiefExecutiveOfficerMember, srt:PresidentMember
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description |  | This assessment is primarily based on segment earnings from operations, as management believes this is the best metric for segment operating performance. The CODM uses operating income as part of their review of the monthly operating results on a segment basis. The actual monthly results are reviewed against budgeted amounts as well as the current year reforecast and prior year actual amounts. Interest and taxes are managed on a centralized basis, and not included in segment operating information.
Number of sectors | Sector |  | 2
Number of reportable business segments | Segment |  | 4
Cement plant locations | Location |  | 8
Slag grinding facility | Facility |  | 2
Cement distribution terminals | Terminal |  | 30
Readymix concrete batch plants |  | 25
Aggregates processing plants |  | 7
Gypsum wallboard plants |  | 5
Proportionate consolidation of share of joint venture revenues and operating earnings |  | 50.00%
Required percentage of purchase partnership interest | 50.00% |
Cost incurred in connection with purchase of partnership interest | $ | $ 550.0 |
Put option effective period | 15 months |
Put option expiration date | Aug. 01, 2025 |
Texas [Member] |  |
Segment Reporting Information [Line Items] |  |
Cement plant locations | Location |  | 1
Slag grinding facility | Facility |  | 1
HM Southeast Cement LLC [Member] |  |
Segment Reporting Information [Line Items] |  |
Partnership interests | 50.00% |
Minimum [Member] |  |
Segment Reporting Information [Line Items] |  |
Consideration for the purchase of assets or operations | $ | $ 1,000.0 |

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