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Goodwill and Other Intangible Assets - Intangible assets gross carrying amounts and accumulated amortization (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Goodwill and Other Intangible Assets      
Goodwill $ 539,899 $ 503,177 $ 492,700
Trade names      
Goodwill and Other Intangible Assets      
Trade names 162,936 161,447  
Patents      
Goodwill and Other Intangible Assets      
Gross carrying amount 2,638 2,516  
Less: accumulated amortization 1,415 1,218  
Net 1,223 1,298  
Capitalized software      
Goodwill and Other Intangible Assets      
Gross carrying amount 134,119 121,883  
Less: accumulated amortization 92,878 80,774  
Net 41,241 41,109  
Customer relationships      
Goodwill and Other Intangible Assets      
Gross carrying amount 330,328 296,927  
Less: accumulated amortization 132,135 113,311  
Net 198,193 183,616  
Other      
Goodwill and Other Intangible Assets      
Gross carrying amount 15,182 14,232  
Less: accumulated amortization 11,173 9,578  
Net $ 4,009 $ 4,654