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Commitments and Contingencies - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2023
Guarantor Obligations [Line Items] |  |  |  |
Additional bonding capacity | $ 556,600,000 |  |  | $ 556,600,000
Cash collateral requirement for guarantees |  |  |  | 2 years
Probable liquidated damages |  |  |  | $ 2,700,000
Loss contingency, estimate of actual or projected loss | 3,900,000 |  |  | 3,900,000
Failure to meet contractual commitments, reduction to revenue | 1,000,000.0 | $ 1,700,000 | $ 1,600,000 | 700,000
Facility Agreement | Powell (UK) Limited |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Guarantee liability, letters of credit | 7,600,000 |  |  | 7,600,000
Revolving credit facility | 9,800,000 |  |  | 9,800,000
Amount of credit facility remaining borrowing capacity | 2,200,000 |  |  | 2,200,000
Surety Bond |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Guarantee liability, letters of credit | $ 393,400,000 |  |  | $ 393,400,000

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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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