GOODWILL AND OTHER INTANGIBLES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 2,393	$ 2,418
Estimated amortization expense, remainder of 2020	9,593
Estimated amortization expense, fiscal 2021	9,387
Estimated amortization expense, fiscal 2022	9,387
Estimated amortization expense, fiscal 2023	9,234
Estimated amortization expense, fiscal 2024	9,208
Estimated amortization expense, fiscal 2025	9,208
Estimated amortization expense, thereafter	$ 80,313