GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible assets gross carrying amounts and accumulated amortization (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
GOODWILL AND OTHER INTANGIBLE ASSETS
Goodwill	$ 505,194	$ 492,709
Less: accumulated amortization	189,819	175,928
Trade names
GOODWILL AND OTHER INTANGIBLE ASSETS
Trade names	161,531	160,024
Customer relationships
GOODWILL AND OTHER INTANGIBLE ASSETS
Gross carrying amount	298,005	287,447
Less: accumulated amortization	105,013	96,921
Net	192,992	190,526
Capitalized software
GOODWILL AND OTHER INTANGIBLE ASSETS
Gross carrying amount	115,191	106,583
Less: accumulated amortization	74,787	70,476
Net	40,404	36,107
Patents
GOODWILL AND OTHER INTANGIBLE ASSETS
Gross carrying amount	2,425	2,353
Less: accumulated amortization	1,154	1,091
Net	1,271	1,262
Other
GOODWILL AND OTHER INTANGIBLE ASSETS
Gross carrying amount	14,298	13,985
Less: accumulated amortization	8,779	7,440
Net	$ 5,519	$ 6,545