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Goodwill and Intangible Assets Intangibles (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 107,767 $ 111,445  
Finite-Lived Intangible Assets, Accumulated Amortization (61,877) (55,237)  
Intangible Assets, Net (Excluding Goodwill) 45,890 56,208  
Amortization of Intangible Assets 13,200 13,684 $ 13,666
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 13,284    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 11,942    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 8,466    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 5,491    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 2,823    
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 3,884    
Trademarks and Trade Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 13,821 14,621  
Finite-Lived Intangible Assets, Accumulated Amortization (6,964) (6,973)  
Intangible Assets, Net (Excluding Goodwill) $ 6,857 $ 7,648  
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 (221) (201)  
Intangible Assets, Net (Excluding Goodwill) $ 179 $ 199  
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 $ 92,796 $ 91,426  
Finite-Lived Intangible Assets, Accumulated Amortization (54,478) (43,065)  
Intangible Assets, Net (Excluding Goodwill) $ 38,318 $ 48,361  
Customer Relationships [Member] | Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 1 year 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  
Finite-Lived Intangible Assets, Accumulated Amortization   (40)  
Intangible Assets, Net (Excluding Goodwill)   $ 0  
Noncompete Agreements [Member] | Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life   5 years  
Construction Contracts [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 750 $ 4,958  
Finite-Lived Intangible Assets, Accumulated Amortization (214) (4,958)  
Intangible Assets, Net (Excluding Goodwill) $ 536 $ 0  
Construction Contracts [Member] | Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 1 year    
Construction Contracts [Member] | Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 2 years 1 year