RESTRUCTURING CHARGES - Summary of Accrued Liability for the Restructuring and Related Charges (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2023	Jun. 30, 2022
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance	$ 17,572	$ 483	$ 650	$ 662	$ 667	$ 682	$ 650	$ 682
Restructuring charges	3,862	78,334		5,909	4,766	1,716
Cash payment	(4,824)	(2,127)	(167)	(5,476)	(3,005)	(1,442)
Non-cash charges		(59,118)		(439)	(1,766)	(289)
Accrued liability ending balance	16,610	17,572	483	656	662	667	16,610	656
Personnel related costs
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance	8,118	312	386	398	403	418	386	418
Restructuring charges	2,234	8,050		1,613	1,878	260
Cash payment	(579)	(244)	(74)	(1,619)	(1,883)	(275)
Non-cash charges		0		0	0	0
Accrued liability ending balance	9,773	8,118	312	392	398	403	9,773	392
Facilities & Exit Costs
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance	9,454	171	264	264	264	264	264	264
Restructuring charges	1,628	11,166		3,857	1,122	1,167
Cash payment	(4,245)	(1,883)	(93)	(3,857)	(1,122)	(1,167)
Non-cash charges		0		0	0	0
Accrued liability ending balance	6,837	9,454	171	264	264	264	6,837	264
Non-cash facility and other
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance	0	0	0	0	0	0	0	0
Restructuring charges	0	59,118		439	1,766	289
Cash payment	0	0	0	0	0	0
Non-cash charges		(59,118)		(439)	(1,766)	(289)
Accrued liability ending balance	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0