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Commitments and Contingencies - Additional Information (Detail) - USD ($) |  |  |  |  | 12 Months Ended
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May 08, 2018 | Jan. 05, 2018 | Jul. 28, 2016 | Jun. 16, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2014
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  | $ 7,500,000 |  |  |
Contingently liable for performance, current |  |  |  |  |  | $ 26,100,000 |  |
Outstanding guarantees |  |  |  |  |  | $ 0 |  |
Percentage of expected natural gas usage |  |  |  |  |  | 25.00% |  |
Operating leases Rental expense |  |  |  |  | 12,000,000 | $ 11,300,000 | $ 10,300,000 |
USG Corporation and United States Gypsum [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation settlement amount |  |  |  |  |  |  |  | $ 48,000,000
Temple Inland Inc. [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation settlement amount |  |  |  |  |  |  |  | $ 7,000,000
Lafarge North America [Member] | Direct Purchaser Class [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation settlement amount |  |  |  | $ 23,000,000 |  |  |  |
Lafarge North America [Member] | Indirect Purchaser Class [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation settlement amount |  |  | $ 5,200,000 |  |  |  |  |
American Gypsum Company LLC [Member] | Homebuilder Settlement Agreement [Member] | Subsequent Event [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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