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Segment Information - Additional Information (Detail) $ in Millions | 6 Months Ended
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Sep. 30, 2020 USD ($) Location Facility Terminal Plant Sector Segment
Segment Reporting [Abstract] |
Number of sectors | Sector | 2
Number of reportable business segments | Segment | 4
Cement plant locations | Location | 8
Slag grinding facility | Facility | 1
Cement distribution terminals | Terminal | 29
Readymix concrete batch plants | 20
Aggregates processing plants | 3
Gypsum wallboard plants | 5
Proportionate consolidation of share of joint venture revenues and operating earnings | 50.00%
Accrued capital expenditures | $ | $ 2.9

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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
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