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Commitments and contingencies - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
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Sep. 30, 2020 | Feb. 29, 2020
Commitments and Contingencies Disclosure [Abstract] |  |
Performance bond commitments | $ 36.5 |
Percentage of employees covered by collective bargaining agreements | 6.00% |
Loss contingency, maximum potential loss | $ 31.0 |
Loss contingency, disallowed amount | $ 19.0 | $ 12.0

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- Definition Loss Contingency, Maximum Potential Loss + References No definition available. + Details
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- Definition The percentage of employees covered by collective bargaining agreements as of the balance sheet date when it serves as a benchmark in a concentration of risk calculation. + References No definition available. + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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