CREDIT LOSSES - Schedule of accounts receivable, allowance for credit losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 12,137	$ 8,787
Allowance for credit losses acquired		2,598
Provision for losses on accounts receivable	971	1,172
Amounts written off charged against the allowance	(1,186)	(251)
Other, primarily foreign currency translation	(658)	(169)
Ending balance	$ 11,264	$ 12,137