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Supporting Financial Information - Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
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Finite-Lived Intangible Assets [Line Items] |  |
Total intangible assets | $ 164,542 | $ 164,542
Total accumulated amortization | (47,993) | (39,765)
Intangible assets, net | 116,549 | 124,777
Customer contracts and related customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangible assets | 113,622 | 113,622
Total accumulated amortization | (35,613) | (29,929)
Covenants not to compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangible assets | 637 | 637
Total accumulated amortization | (410) | (378)
Trade name |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangible assets | 13,034 | 13,034
Total accumulated amortization | (2,836) | (2,185)
Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangible assets | 37,249 | 37,249
Total accumulated amortization | $ (9,134) | $ (7,273)

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