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Commitments and Contingencies - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 08, 2018 | Jan. 05, 2018 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  | $ 7,700,000 |  |
Contingently liable for performance, current |  |  |  | 26,300,000 |  |
Outstanding guarantees |  |  |  | $ 0 |  |
Percentage of expected natural gas usage |  |  |  | 25.00% |  |
Operating leases Rental expense |  |  |  | $ 12,300,000 | $ 12,000,000 | $ 11,300,000
American Gypsum Company LLC [Member] | Homebuilder Settlement Agreement [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Litigation settlement amount | $ 6,000,000 |  |  |  |  |
American Gypsum Company LLC [Member] | Direct and Indirect Purchaser Class [Member] | Direct and Indirect Purchaser Settlement Agreements [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Litigation settlement amount |  | $ 39,100,000 |  |  |  |
Amount deposited to qualified settlement fund |  |  | $ 38,800,000 |  |  |

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- Definition Amount deposited to qualified settlement fund. + References No definition available. + Details
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- Definition Commitments and contingencies. + References No definition available. + Details
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- Definition Contingent liability for performance bonds required by states municipalities and related agencies. + References No definition available. + Details
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- Definition Percentage of expected natural gas usage. + References No definition available. + Details
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- Definition This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913062&loc=d3e11019-110243 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913062&loc=d3e11049-110243 + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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