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Commitments and Contingencies (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Guarantee Obligations [Line Items] |  |
Additional bonding capacity | $ 777.9 |
Cash collateral required for guarantees, period (greater than) | 2 years |
Contracts with probable exposure to liquidated damages | $ 2.5 |
Probable exposure potential increase | 2.8 |
Change in contract estimates, reduction to revenue | 1.7 | $ 3.4
Surety Bonds |  |
Guarantee Obligations [Line Items] |  |
Guarantee liability | 422.1 |
Facility Agreement | Powell (UK) Limited |  |
Guarantee Obligations [Line Items] |  |
Guarantee liability | 6.4 |
Revolving credit facility | 19.0 |
Amount of credit facility remaining borrowing capacity | 12.6 |
Revolving Credit Facility | U.S. Revolver |  |
Guarantee Obligations [Line Items] |  |
Amount of credit facility remaining borrowing capacity | 81.6 |
Revolving Credit Facility | U.S. Revolver | Financial Standby Letter of Credit |  |
Guarantee Obligations [Line Items] |  |
Guarantee liability | $ 68.4 |

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- Definition Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in measure of progress which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 + Details
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