LONG-TERM DEBT (Revolving Credit Facility) (Details) (Revolving Credit Facility [Member], USD $)	12 Months Ended
	Sep. 30, 2014	Feb. 13, 2014	Sep. 30, 2013
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 499,000,000
Actual Ratio Of Total Priority Debt To Ebitda At Period End	0.36
Commitment fee percentage	0.50%
Amount outstanding	0		0
Amount outstanding	0		0
Amended Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum Collateral Test Value	1.0
Value Of Company Assets Collateralized	615,000,000
Maximum limit on issuance of letters of credit	100,000,000
Revolving Credit Facility - Amended - Matures In February 2019 [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		410,000,000
Revolving Credit Facility - Amended - Matures In April 2017 [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 89,000,000
Triggering Event One [Member]
Debt Instrument [Line Items]
Required Ratio of Total Priority Debt to EBITDA Through Period Ended	2.25
LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	3.50%
Prime Rate [Member] | Overnight Revolving Credit Loans [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%