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Supporting Financial Information - Intangible Assets, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 65,854 $ 65,854
Less accumulated amortization (24,970) (18,385)
Intangible assets, net 40,884 47,469
Amortization expense of intangibles 6,600  
Customer contracts and related customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross 62,281 62,281
Less accumulated amortization (23,606) (17,378)
Covenants-not-to-compete    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross 522 522
Less accumulated amortization (316) (264)
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross 3,051 3,051
Less accumulated amortization $ (1,048) $ (743)