Segment Breakdown of Goodwill (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Goodwill	$ 329,137	$ 329,137
Cement [Member]
Segment Reporting Information [Line Items]
Goodwill	203,342	203,342
Concrete and Aggregates [Member]
Segment Reporting Information [Line Items]
Goodwill	1,639	1,639
Gypsum Wallboard [Member]
Segment Reporting Information [Line Items]
Goodwill	116,618	116,618
Paperboard [Member]
Segment Reporting Information [Line Items]
Goodwill	$ 7,538	$ 7,538

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.9-03(10)(1))
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
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-Section 55
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-Name Accounting Standards Codification
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