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Goodwill and Intangible Assets Intangibles (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 117,359 $ 117,538  
Finite-Lived Intangible Assets, Accumulated Amortization (45,423) (31,919)  
Intangible Assets, Net (Excluding Goodwill) 71,936 85,619  
Amortization of Intangible Assets 13,666 13,191 $ 6,424
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 13,153    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 12,810    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 12,370    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 12,031    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 8,631    
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 12,941    
Trademarks and Trade Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 15,262 15,262  
Finite-Lived Intangible Assets, Accumulated Amortization (4,589) (2,891)  
Intangible Assets, Net (Excluding Goodwill) $ 10,673 $ 12,371  
Trademarks and Trade Names [Member] | Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 5 years 5 years  
Trademarks and Trade Names [Member] | Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 20 years 20 years  
Technical Library      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 400 $ 400  
Finite-Lived Intangible Assets, Accumulated Amortization (181) (161)  
Intangible Assets, Net (Excluding Goodwill) $ 219 $ 239  
Technical Library | Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 20 years 20 years  
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 96,699 $ 96,879  
Finite-Lived Intangible Assets, Accumulated Amortization (35,662) (24,021)  
Intangible Assets, Net (Excluding Goodwill) $ 61,037 $ 72,858  
Customer Relationships [Member] | Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 6 years 6 years  
Customer Relationships [Member] | Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 15 years 15 years  
Noncompete Agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 40 $ 40  
Finite-Lived Intangible Assets, Accumulated Amortization (33) (25)  
Intangible Assets, Net (Excluding Goodwill) $ 7 $ 15  
Noncompete Agreements [Member] | Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 5 years 5 years  
Construction Contracts [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 4,958 $ 4,957  
Finite-Lived Intangible Assets, Accumulated Amortization (4,958) (4,821)  
Intangible Assets, Net (Excluding Goodwill) $ 0 $ 136  
Construction Contracts [Member] | Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 1 year 1 year