LONG-TERM DEBT - Term Loan (Details) - USD ($)		12 Months Ended
	Feb. 13, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Apr. 23, 2012
Debt Instrument [Line Items]
Gain (loss) on repayment of debt		$ (25,000,000)	$ (31,000,000)	$ (24,000,000)
Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount					$ 100,000,000
Repayments of debt	$ 41,000,000
Gain (loss) on repayment of debt	$ (2,000,000)