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Supporting Financial Information - Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Sep. 30, 2025
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets $ 164,542 $ 164,542
Total accumulated amortization (76,790) (72,677)
Intangible assets, net 87,752 91,865
Customer contracts and related customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets 113,622 113,622
Total accumulated amortization (55,507) (52,665)
Covenants-not-to-compete    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets 637 637
Total accumulated amortization (522) (506)
Trade name    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets 13,034 13,034
Total accumulated amortization (5,117) (4,792)
Backlog    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets 37,249 37,249
Total accumulated amortization $ (15,644) $ (14,714)