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Commitments and Contingencies (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Jun. 30, 2023 | Mar. 30, 2023
Guarantee Obligations [Line Items] |  |
Additional bonding capacity | $ 342,500,000 |
Cash collateral required for guarantees, period (greater than) | 2 years |
Surety Bonds |  |
Guarantee Obligations [Line Items] |  |
Guarantee liability | $ 357,500,000 |
Facility Agreement | Powell (UK) Limited |  |
Guarantee Obligations [Line Items] |  |
Guarantee liability | 8,200,000 |
Revolving credit facility | 10,100,000 |
Revolving Credit Facility | U.S. Revolver |  |
Guarantee Obligations [Line Items] |  |
Revolving credit facility | 125,000,000 | $ 75,000,000
Revolving Credit Facility | U.S. Revolver | Financial Standby Letter of Credit |  |
Guarantee Obligations [Line Items] |  |
Guarantee liability | $ 49,000,000 |

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