POST EMPLOYMENT BENEFITS - Reconciliation of Projected Benefit Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Retirement Benefits [Abstract]
Accumulated benefit obligation:	$ 15,545	$ 12,957
Change in projected benefit obligation:
Projected benefit obligation, beginning of period	12,957	12,812
Other	254	0
Interest cost	741	733
Benefits paid	(684)	(570)
Foreign currency translation adjustment	1,328	1,235
Actuarial gains (losses)	949	(1,253)
Projected benefit obligation at end of period	15,545	12,957
Change in fair value of plan assets:
Fair value of plan assets, beginning of period	15,993	14,385
Actual gain (loss) on plan assets	1,764	(427)
Employer contributions	0	1,226
Foreign currency translation adjustment	1,614	1,379
Benefits paid	(684)	(570)
Fair value of plan assets, end of period	18,687	15,993
Funded status	$ 3,142	$ 3,036