LONG-TERM DEBT - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Oct. 14, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Debt Disclosure [Abstract]
Total refinancing costs	$ 95,600
Previously deferred debt issuance costs	14,900
Loss on modification and early extinguishment of debt, net	58,900	$ 0	$ 0	$ 73,796	$ 207
New debt issuance costs	2,500
New debt discount	$ 34,200