LONG-TERM DEBT (Senior Notes Narrative) (Details) (Senior Notes [Member], USD $)	1 Months Ended	12 Months Ended				3 Months Ended		12 Months Ended
	Jan. 31, 2012 6.5% Senior Notes [Member]	Sep. 30, 2013 6.5% Senior Notes [Member]	Jun. 21, 2013 6.5% Senior Notes [Member]	Sep. 30, 2012 6.5% Senior Notes [Member]	Jan. 18, 2012 6.5% Senior Notes [Member]	Sep. 30, 2013 Add-on 6.5% Senior Notes [Member]	Jun. 21, 2013 Add-on 6.5% Senior Notes [Member]	Sep. 30, 2013 Prior to Februrary 1, 2015 [Member] 6.5% Senior Notes [Member]	Sep. 30, 2013 Prior to February 1, 2016 [Member] 6.5% Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount		$ 650,000,000	$ 650,000,000		$ 450,000,000		$ 200,000,000
Stated interest rate		6.50%		6.50%	6.50%
Proceeds from debt, net of issuance costs	440,000,000					211,600,000
Accrued interest							5,100,000
Debt premium							8,500,000
Effective interest rate			6.26%				5.72%
Indenture governing final judgments, maximum amount		$ 50,000,000.0
Debt instrument redeemable percentage								35.00%
Debt instrument redemption price percentage									100.00%