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Contingencies, Significant Estimates and Concentrations - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 CAD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Approximate percentage of workforce covered under collective bargaining agreements (as a percent) |  | 23.00% | 23.00% |  |  |
Miscellaneous, net | [1] |  | $ 2,200,000 | $ 1,300,000 | $ (5,800,000) |
Defense |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation compensation recommendation |  |  |  |  |  | $ 25.3
Former Gain Contingency, Recognized in Current Period |  | $ 4,200,000 | 4,200,000 |  | 19,000,000.0 |
Commercial |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Former Gain Contingency, Recognized in Current Period |  | 1,500,000 | 1,500,000 |  |  |
Gain on Business Interruption Insurance Recovery |  | 18,500,000 | 18,500,000 |  | $ 6,600,000 |
Reduction of cost of sales |  |  | 10,800,000 |  |  |
Miscellaneous, net |  |  | 6,200,000 |  |  |
Personal Injury Actions and Other |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Maximum self-insurance available per claim |  |  | 5,000,000.0 |  |  |
Reserve for loss contingencies |  | 33,800,000 | 33,800,000 | 36,200,000 |  |
Performance and Specialty Bonds |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Commitments and contingencies |  | 721,100,000 | 721,100,000 | 552,200,000 |  |
Standby Letters of Credit |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Commitments and contingencies |  | $ 64,400,000 | $ 64,400,000 | $ 63,700,000 |  |
[1] | Fiscal 2020 results include a $6.2 million gain from insurance proceeds in excess of property loss in the Commercial segment.

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