INCOME TAXES - Income Tax Benefit (Provision) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Domestic									$ 23,836	$ 11,483	$ 10,966
Foreign									(13,495)	(7,881)	(2,164)
Income before income taxes									10,341	3,602	8,802
Current:
Federal									(4,414)	(233)	0
State									(1,215)	(325)	(78)
Foreign									(1,023)	(1,800)	(1,119)
Total current provision for income taxes									(6,652)	(2,358)	(1,197)
Deferred:
Federal									(659)	(1,400)	(1,387)
State									819	513	457
Foreign									4,178	3,337	1,303
Total deferred provision for income taxes									4,338	2,450	373
Total tax benefit (expense)	$ 2,123	$ (783)	$ (1,808)	$ (1,846)	$ (976)	$ 880	$ 20	$ 168	$ (2,314)	$ 92	$ (824)