GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2023
Goodwill and Intangible Assets [Line Items]
Goodwill	$ 126,271,000		$ 126,271,000		$ 123,548,000
Goodwill impairment	0	$ 0	0	$ 0
Amortization of intangible assets	3,700,000	4,300,000	11,445,000	13,270,000
Impairment charges related to intangible assets	$ 0	$ 0	$ 0	$ 0
Minimum
Goodwill and Intangible Assets [Line Items]
Estimated useful lives of intangible assets (in years)	3 years		3 years
Maximum
Goodwill and Intangible Assets [Line Items]
Estimated useful lives of intangible assets (in years)	7 years		7 years