INCOME TAXES - Schedule of Calculation of the Effective Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 5,886			$ 689			$ 4,315	$ (11,134)
Income tax expense (benefit)	797			388			963	(2,443)
Net income (loss)	$ 5,089	$ 958	$ (2,695)	$ 301	$ (3,330)	$ (5,662)	$ 3,352	$ (8,691)
Effective tax rate	14.00%			56.00%			22.00%	22.00%