FAIR VALUE OF FINANCIAL INSTRUMENTS (Narrative) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Jun. 21, 2013	Jan. 31, 2012
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, carrying value	$ 1,742,122,000	$ 1,263,232,000
Credit valuation adjustment to total fair value percentage (less than 1%)	1.00%
6.5% Senior Notes [Member] | Senior Notes [Member]
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, carrying value	657,122,000	658,232,000
Principal amount	650,000,000		650,000,000	450,000,000
Long-term debt, fair value	$ 666,000,000