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Goodwill and Other Intangible Assets - Intangible assets gross carrying amounts and accumulated amortization from continuing operations (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Goodwill and Other Intangible Assets      
Goodwill $ 761,931 $ 529,935 $ 493,200
Patents      
Goodwill and Other Intangible Assets      
Gross carrying amount 7,607 2,638  
Less: accumulated amortization 1,775 1,415  
Net 5,832 1,223  
Capitalized software      
Goodwill and Other Intangible Assets      
Gross carrying amount 138,144 126,721  
Less: accumulated amortization 100,818 89,558  
Net 37,326 37,163  
Customer Relationships      
Goodwill and Other Intangible Assets      
Gross carrying amount 625,535 330,328  
Less: accumulated amortization 159,543 132,135  
Net 465,992 198,193  
Other      
Goodwill and Other Intangible Assets      
Gross carrying amount 76,991 15,182  
Less: accumulated amortization 24,829 11,173  
Net 52,162 4,009  
Trade names      
Goodwill and Other Intangible Assets      
Trade names $ 162,661 $ 162,936