INCOME TAXES - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Current:
Federal	$ 13,967	$ 13,481	$ (3,741)
State	4,381	4,676	3,579
Foreign	5,052	10,414	2,379
Total provision for income taxes, current	23,400	28,571	2,217
Deferred:
Federal	(14,466)	(24,239)	5,829
State	(1,887)	(3,895)	169
Foreign	(5,273)	(4,828)	(1,840)
Deferred	(21,626)	(32,962)	4,158
Total	$ 1,774	$ (4,391)	$ 6,375