GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024
Goodwill and Intangible Assets [Line Items]
Goodwill	$ 128,051,000		$ 128,051,000		$ 131,574,000
Goodwill impairment			0	$ 0
Amortization of intangible assets	3,600,000	$ 3,800,000	7,257,000	7,694,000
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