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v3.22.1

Commitments and Contingencies (Details) | 6 Months Ended
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Mar. 31, 2022 USD ($)
Guarantee Obligations [Line Items] |
Additional bonding capacity | $ 451,000,000
Cash collateral required for guarantees, period (greater than) | 2 years
Surety Bonds |
Guarantee Obligations [Line Items] |
Guarantee liability | $ 149,000,000
Amended and Restated Credit Agreement | U.S. Revolver |
Guarantee Obligations [Line Items] |
Revolving credit facility | 75,000,000
Amount of credit facility remaining borrowing capacity | 42,800,000
Amended and Restated Credit Agreement | U.S. Revolver | Financial Standby Letter of Credit |
Guarantee Obligations [Line Items] |
Guarantee liability | 32,200,000
Facility Agreement | Powell (UK) Limited |
Guarantee Obligations [Line Items] |
Guarantee liability | 3,200,000
Revolving credit facility | 6,600,000
Amount of credit facility remaining borrowing capacity | $ 3,400,000

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