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Commitments and Contingencies (Details)
$ in Millions
 12 Months Ended
Sep. 30, 2025
USD ($)
Guarantor Obligations [Line Items]  
Additional bonding capacity $ 782.7
Cash collateral requirement for guarantees 2 years
Probable liquidated damages $ 3.7
Loss contingency, estimate of actual or projected loss 4.3
Failure to meet contractual commitments, reduction to revenue 3.4
Surety Bond  
Guarantor Obligations [Line Items]  
Guarantee liability, letters of credit 417.3
Facility Agreement | Powell (UK) Limited  
Guarantor Obligations [Line Items]  
Guarantee liability, letters of credit 3.9
Revolving credit facility 20.2
Amount of credit facility remaining borrowing capacity 16.3
U.S. Revolver | Amended and Restated Credit Agreement  
Guarantor Obligations [Line Items]  
Amount of credit facility remaining borrowing capacity 72.5
U.S. Revolver | Amended and Restated Credit Agreement | Financial Standby Letter of Credit  
Guarantor Obligations [Line Items]  
Guarantee liability, letters of credit $ 77.5