GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill additions	$ 0		$ 0
Impairments of goodwill	0		0
Goodwill	45,653,000		45,653,000		$ 45,653,000
Amortization	1,600,000	$ 1,800,000	3,400,000	$ 3,600,000
Expected amortization in remainder 2023	3,200,000		3,200,000
Expected amortization in 2024	6,400,000		6,400,000
Expected amortization in 2025	6,400,000		6,400,000
Expected amortization in 2026	6,400,000		6,400,000
Expected amortization in 2027	$ 6,400,000		$ 6,400,000

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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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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