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Segment Information - Additional Information (Detail) | 6 Months Ended
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Sep. 30, 2025 Facility Plant Location Terminal Segment Sector MT
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 segment profit as part of his 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 are 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
Annual production capacity | MT | 9
Gypsum wallboard plants | 5
Proportionate consolidation of share of joint venture revenues and operating earnings | 50.00%
Texas [Member] |
Segment Reporting Information [Line Items] |
Cement plant locations | Location | 1
Slag grinding facility | Facility | 1

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- Definition Aggregates processing plants. + References No definition available. + Details
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- Definition Annual production capacity. + References No definition available. + Details
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- Definition Cement distribution terminals. + References No definition available. + Details
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- Definition Cement plant locations. + References No definition available. + Details
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- Definition Gypsum wallboard plants. + References No definition available. + Details
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- Definition Readymix plants. + References No definition available. + Details
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- Definition Segment reporting information proportionate consolidation of joint ventures revenues and operating earnings. + References No definition available. + Details
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- Definition Slag grinding facility. + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 47 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-47 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 54 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-54 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-18 + Details
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- Definition Indicates title and position of individual or name of group identified as chief operating decision maker (CODM) for segment reporting. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 54 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-54 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 47 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-47 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-21 + Details
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- Definition Description of how chief operating decision maker (CODM) uses reported segment profit (loss) measure to assess performance and allocate resource. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 47 -Subparagraph (bb) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-47 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 54 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-54 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 29 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-29 + Details
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