INCOME TAXES - Schedule of Effective Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 689	$ (6,898)	$ (11,134)	$ (10,812)
Income tax provision (benefit)	388	(3,683)	(2,443)	(6,469)
Net income (loss)	$ 301	$ (3,215)	$ (8,691)	$ (4,343)
Effective tax rate	56.00%	53.00%	22.00%	60.00%