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Commitments and Contingencies (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Jan. 31, 2022
Guarantee Obligations [Line Items] |  |
Additional bonding capacity | $ 455,600,000 |
Cash collateral required for guarantees, period (greater than) | 2 years |
Facility Agreement | Powell (UK) Limited |  |
Guarantee Obligations [Line Items] |  |
Guarantee liability | $ 3,300,000 |
Revolving credit facility | 9,500,000 |
Amount of credit facility remaining borrowing capacity | 6,200,000 |
Facility Agreement | Powell (UK) Limited | Subsequent Event |  |
Guarantee Obligations [Line Items] |  |
Revolving credit facility |  | $ 6,800,000
Surety Bonds |  |
Guarantee Obligations [Line Items] |  |
Guarantee liability | 144,400,000 |
U.S. Revolver | Amended and Restated Credit Agreement |  |
Guarantee Obligations [Line Items] |  |
Revolving credit facility | 75,000,000 |
Amount of credit facility remaining borrowing capacity | 43,800,000 |
U.S. Revolver | Financial Standby Letter of Credit | Amended and Restated Credit Agreement |  |
Guarantee Obligations [Line Items] |  |
Guarantee liability | $ 31,200,000 |

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