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Supporting Financial Information - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items]        
Intangible assets, gross $ 65,854   $ 65,854 $ 65,854
Total accumulated amortization (23,324)   (23,324) (18,385)
Intangible assets, net 42,530   $ 42,530 47,469
Estimated useful live of intangible assets     10 years  
Amortization expense of intangible assets 1,600 $ 1,600 $ 4,900  
Customer contracts and related customer relationships        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets, gross 62,281   62,281 62,281
Total accumulated amortization (22,049)   (22,049) (17,378)
Covenants not to compete        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets, gross 522   522 522
Total accumulated amortization (303)   (303) (264)
Trade name        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets, gross 3,051   3,051 3,051
Total accumulated amortization $ (972)   $ (972) $ (743)