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Goodwill and Intangible Assets Intangibles (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 117,168 $ 107,767  
Finite-Lived Intangible Assets, Accumulated Amortization (75,523) (61,877)  
Intangible Assets, Net (Excluding Goodwill) 41,645 45,890  
Amortization of Intangible Assets 13,646 13,200 $ 13,684
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 13,426    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 9,879    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 6,789    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 4,064    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 3,186    
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 4,300    
Trademarks and Trade Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 16,199 13,821  
Finite-Lived Intangible Assets, Accumulated Amortization (8,549) (6,964)  
Intangible Assets, Net (Excluding Goodwill) $ 7,650 $ 6,857  
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 (241) (221)  
Intangible Assets, Net (Excluding Goodwill) $ 159 $ 179  
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 $ 98,372 $ 92,796  
Finite-Lived Intangible Assets, Accumulated Amortization (66,024) (54,478)  
Intangible Assets, Net (Excluding Goodwill) $ 32,348 $ 38,318  
Customer Relationships [Member] | Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 1 year 1 year  
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 $ 940    
Finite-Lived Intangible Assets, Accumulated Amortization (31)    
Intangible Assets, Net (Excluding Goodwill) $ 909    
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 $ 1,257 $ 750  
Finite-Lived Intangible Assets, Accumulated Amortization (678) (214)  
Intangible Assets, Net (Excluding Goodwill) $ 579 $ 536  
Construction Contracts [Member] | Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 1 year 1 year  
Construction Contracts [Member] | Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 2 years 2 years