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Commitments and Contingencies (Details) $ in Millions | 6 Months Ended
--- | ---
Mar. 31, 2024 USD ($)
Guarantee Obligations [Line Items] |
Additional bonding capacity | $ 718.1
Cash collateral required for guarantees, period (greater than) | 2 years
Contracts with probable exposure to liquidated damages | $ 1.7
Probable exposure potential increase | 2.1
Change in contract estimates, reduction to revenue | 1.0
Surety Bonds |
Guarantee Obligations [Line Items] |
Guarantee liability | 481.9
Facility Agreement | Powell (UK) Limited |
Guarantee Obligations [Line Items] |
Guarantee liability | 7.4
Revolving credit facility | 18.9
Amount of credit facility remaining borrowing capacity | 11.5
Revolving Credit Facility | U.S. Revolver |
Guarantee Obligations [Line Items] |
Amount of credit facility remaining borrowing capacity | 62.2
Revolving Credit Facility | U.S. Revolver | Financial Standby Letter of Credit |
Guarantee Obligations [Line Items] |
Guarantee liability | $ 87.8

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