v3.26.1
Supporting Financial Information - Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Sep. 30, 2025
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets $ 163,545 $ 164,542
Total accumulated amortization (83,727) (72,677)
Intangible assets, net $ 79,818 91,865
Intangible assets, remaining amortization period 5 years 9 months 18 days  
Customer contracts and related customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets $ 113,622 113,622
Total accumulated amortization $ (60,914) (52,665)
Intangible assets, remaining amortization period 5 years 9 months 18 days  
Backlog    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets $ 37,249 37,249
Total accumulated amortization $ (17,505) (14,714)
Intangible assets, remaining amortization period 5 years 8 months 12 days  
Trade name    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets $ 12,517 13,034
Total accumulated amortization $ (5,243) (4,792)
Intangible assets, remaining amortization period 6 years 1 month 6 days  
Covenants-not-to-compete    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets $ 157 637
Total accumulated amortization $ (65) $ (506)
Intangible assets, remaining amortization period 6 years