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Commitments and Contingencies - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 28, 2016 | Jun. 16, 2016 | Jan. 31, 2017 | Sep. 30, 2017 | Mar. 31, 2014
Commitments And Contingencies [Line Items] |  |  |  |  |
Letters of credit outstanding, amount |  |  |  | $ 9,400,000 |
Outstanding guarantees |  |  |  | 0 |
Contingently liable for performance, current |  |  |  | $ 21,100,000 |
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 |  |  |  |
NCC [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Payment of penalty to reduce nitrous oxide emissions |  |  | $ 600,000 |  |
Installation of emission control equipment and vehicle replacement period |  |  | 2 years |  |
Anticipated cost of investment for new emission control equipment and vehicles |  |  | $ 3,000,000 |  |
EPA notice of violation description |  |  |  | In January 2017, NCC entered into a Consent Decree in which NCC agreed to install at its Fernley, Nevada plant certain emission control equipment (selective non-catalytic reduction) to reduce nitrous oxide emissions and to pay a penalty of $0.6 million. NCC also agreed to replace two existing vehicles with two new vehicles with more efficient Tier 4 engines. Under the terms of the Consent Decree, NCC will complete the installation of the emission control equipment and vehicle replacement in approximately 2 years. It is anticipated that the investment in the new emission control equipment and vehicles will cost approximately $3.0 million. In the Consent Decree NCC denies all allegations set forth in the NOVs and the Complaint which was filed simultaneously with the entry of the Consent Decree, and the Consent Decree resolves all such claims by the government. The Consent Decree was signed by the EPA and the US Department of Justice and lodged in US District Court for the District of Nevada in May 2017. On October 4, 2017, the Consent Decree was entered by the Court and NCC paid the penalty in early October. |

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