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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Goodwill	$ 131,574,000	$ 131,574,000	$ 123,548,000	$ 115,632,000
Goodwill impairment	$ 0	0
Amortization of intangible assets		15,156,000	16,992,000	13,547,000
Impairment charges related to intangible assets		0	0	0
Acquisition-Related Costs and Expenses
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Amortization of intangible assets		$ 15,200,000	$ 17,000,000	$ 13,500,000
Minimum
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Estimated useful lives of intangible assets (in years)	3 years	3 years
Maximum
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Estimated useful lives of intangible assets (in years)	7 years	7 years

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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