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Commitments and Contingencies - Narrative (Details) | 12 Months Ended
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Sep. 30, 2020 USD ($)
Guarantor Obligations [Line Items] |
Additional bonding capacity | $ 587,600,000
Cash collateral requirement for guarantees | 2 years
Loss contingency, estimate of actual or projected loss | $ 2,400,000
Probable liquidated damages | 200,000
Failure to meet contractual commitments, reduction to revenue | 200,000
Facility Agreement | Powell (UK) Limited |
Guarantor Obligations [Line Items] |
Guarantee liability | 7,200,000
Revolving credit facility | 9,000,000.0
Amount of credit facility remaining borrowing capacity | 1,800,000
Surety Bond |
Guarantor Obligations [Line Items] |
Guarantee liability | 162,400,000
U.S. Revolver | Financial Standby Letter of Credit | Facility Agreement |
Guarantor Obligations [Line Items] |
Guarantee liability | $ 38,700,000

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