POST EMPLOYMENT BENEFITS - Changes in the benefit obligation funded status of the Company's defined benefit plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
POST EMPLOYMENT BENEFITS
Accumulated benefit obligation	$ 12,812
Change in projected benefit obligation:
Projected benefit obligation, acquisition date	24,302
Service cost	0
Interest cost	381
Contributions by plan participants	0
Benefits paid	(595)
Foreign currency translation adjustment	(3,370)
Actuarial (gains) losses	(7,906)
Projected benefit obligation at end of period	12,812
Change in fair value of plan assets:
Fair value of plan assets, acquisition date	21,269
Actual loss on plan assets	(3,948)
Employer contributions	1,059
Foreign currency translation adjustment	(3,400)
Benefits paid	(595)
Fair value of plan assets, end of period	14,385
Funded status	$ 1,573	$ 0