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Supporting Financial Information - Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Total intangible assets | $ 164,542 | $ 164,542
Total accumulated amortization | (64,449) | (56,221)
Intangible assets, net | 100,093 | 108,321
Customer contracts and related customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangible assets | 113,622 | 113,622
Total accumulated amortization | (46,981) | (41,297)
Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangible assets | 37,249 | 37,249
Total accumulated amortization | (12,854) | (10,994)
Trade name |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangible assets | 13,034 | 13,034
Total accumulated amortization | (4,140) | (3,488)
Covenants-not-to-compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangible assets | 637 | 637
Total accumulated amortization | $ (474) | $ (442)

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