GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible assets gross carrying amounts and accumulated amortization (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
GOODWILL AND OTHER INTANGIBLE ASSETS
Goodwill	$ 505,590	$ 492,709
Less: accumulated amortization	196,951	175,928
Trade names
GOODWILL AND OTHER INTANGIBLE ASSETS
Trade names	161,952	160,024
Customer relationships
GOODWILL AND OTHER INTANGIBLE ASSETS
Gross carrying amount	298,110	287,447
Less: accumulated amortization	109,186	96,921
Net	188,924	190,526
Capitalized software
GOODWILL AND OTHER INTANGIBLE ASSETS
Gross carrying amount	118,529	106,583
Less: accumulated amortization	77,308	70,476
Net	41,221	36,107
Patents
GOODWILL AND OTHER INTANGIBLE ASSETS
Gross carrying amount	2,433	2,353
Less: accumulated amortization	1,186	1,091
Net	1,247	1,262
Other
GOODWILL AND OTHER INTANGIBLE ASSETS
Gross carrying amount	14,345	13,985
Less: accumulated amortization	9,271	7,440
Net	$ 5,074	$ 6,545