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Goodwill and Intangible Assets Intangibles (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 111,445 $ 117,359  
Finite-Lived Intangible Assets, Accumulated Amortization (55,237) (45,423)  
Intangible Assets, Net (Excluding Goodwill) 56,208 71,936  
Amortization of Intangible Assets 13,684 13,666 $ 13,191
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 12,265    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 12,081    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 11,760    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 8,391    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 5,416    
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 6,295    
Trademarks and Trade Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 14,621 15,262  
Finite-Lived Intangible Assets, Accumulated Amortization (6,973) (4,589)  
Intangible Assets, Net (Excluding Goodwill) $ 7,648 $ 10,673  
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 (201) (181)  
Intangible Assets, Net (Excluding Goodwill) $ 199 $ 219  
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 $ 91,426 $ 96,699  
Finite-Lived Intangible Assets, Accumulated Amortization (43,065) (35,662)  
Intangible Assets, Net (Excluding Goodwill) $ 48,361 $ 61,037  
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 (40) (33)  
Intangible Assets, Net (Excluding Goodwill) $ 0 $ 7  
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 $ 4,958  
Finite-Lived Intangible Assets, Accumulated Amortization (4,958) (4,958)  
Intangible Assets, Net (Excluding Goodwill) $ 0 $ 0  
Construction Contracts [Member] | Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 1 year 1 year