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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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Additions to goodwill	$ 0
Impairments of goodwill	0
Goodwill	82,786,000		$ 82,786,000
Amortization expense	1,900,000	$ 1,400,000
Expected amortization in 2020	7,100,000
Expected amortization in 2021	7,200,000
Expected amortization in 2022				$ 7,200,000
Expected amortization in 2023	6,500,000
Expected amortization in 2024	$ 6,400,000