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Commitments and Contingencies - Narrative (Details) | 12 Months Ended
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Sep. 30, 2021 USD ($)
Guarantor Obligations [Line Items] |
Additional bonding capacity | $ 457,000,000
Cash collateral requirement for guarantees | 2 years
Loss contingency, estimate of actual or projected loss | $ 1,800,000
Probable liquidated damages | 1,100,000
Failure to meet contractual commitments, reduction to revenue | 1,100,000
Facility Agreement | Powell (UK) Limited |
Guarantor Obligations [Line Items] |
Guarantee liability, letters of credit | 7,400,000
Revolving credit facility | 9,400,000
Amount of credit facility remaining borrowing capacity | 2,000,000
Surety Bond |
Guarantor Obligations [Line Items] |
Guarantee liability, letters of credit | 143,000,000
U.S. Revolver | Amended And Restated Credit Agreement |
Guarantor Obligations [Line Items] |
Revolving credit facility | 75,000,000
Amount of credit facility remaining borrowing capacity | 40,200,000
U.S. Revolver | Financial Standby Letter of Credit | Amended And Restated Credit Agreement |
Guarantor Obligations [Line Items] |
Guarantee liability, letters of credit | $ 34,800,000

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