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GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible assets gross carrying amounts and accumulated amortization (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Sep. 30, 2023
GOODWILL AND OTHER INTANGIBLE ASSETS    
Goodwill $ 535,372 $ 503,177
Less: accumulated amortization 229,467 204,881
Patents    
GOODWILL AND OTHER INTANGIBLE ASSETS    
Gross carrying amount 2,551 2,516
Less: accumulated amortization 1,322 1,218
Net 1,229 1,298
Capitalized software    
GOODWILL AND OTHER INTANGIBLE ASSETS    
Gross carrying amount 130,648 121,883
Less: accumulated amortization 89,737 80,774
Net 40,911 41,109
Customer relationships    
GOODWILL AND OTHER INTANGIBLE ASSETS    
Gross carrying amount 327,537 296,927
Less: accumulated amortization 127,322 113,311
Net 200,215 183,616
Other    
GOODWILL AND OTHER INTANGIBLE ASSETS    
Gross carrying amount 15,122 14,232
Less: accumulated amortization 11,085 9,578
Net 4,037 4,654
Trade names    
GOODWILL AND OTHER INTANGIBLE ASSETS    
Trade names $ 162,589 $ 161,447