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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 123,548	$ 115,632
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Goodwill	123,548	115,632
Amortization of intangible assets	16,992	13,547	$ 7,505
Acquisition-Related Costs and Expenses
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Amortization of intangible assets	$ 17,000	$ 13,500	$ 7,500
Minimum
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Estimated useful lives of intangible assets (in years)	3 years
Maximum
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Estimated useful lives of intangible assets (in years)	7 years

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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