LONG-TERM DEBT (Convertible Notes) (Details) (USD $)	12 Months Ended										12 Months Ended						1 Months Ended					12 Months Ended	1 Months Ended	12 Months Ended				12 Months Ended				12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2014 7.875% convertible notes due 2026 [Member]	Sep. 30, 2013 7.875% convertible notes due 2026 [Member]	Sep. 30, 2014 4.625 Percent Convertible Notes Due 2026 [Member]	Sep. 30, 2014 4.0 Percent Convertible Notes Due 2027 [Member]		Sep. 30, 2014 Convertible Debt [Member]	Sep. 30, 2013 Convertible Debt [Member]	Sep. 30, 2014 Convertible Debt [Member] Convertible Notes 2006 Member]	Sep. 30, 2014 Convertible Debt [Member] Convertible Notes 2007 [Member]	Sep. 30, 2014 Convertible Debt [Member] Convertible Notes 2013 [Member]	Sep. 30, 2014 Convertible Notes [Member] D	Sep. 30, 2013 Convertible Notes [Member]	Sep. 30, 2012 Convertible Notes [Member]	Dec. 31, 2012 Convertible Notes [Member] 7.875% convertible notes due 2026 [Member]	Sep. 30, 2014 Convertible Notes [Member] 7.875% convertible notes due 2026 [Member]		Sep. 30, 2013 Convertible Notes [Member] 7.875% convertible notes due 2026 [Member]		Sep. 30, 2012 Convertible Notes [Member] Adoption Of Guidance For Debt With Conversion and Other Options [Member]	Dec. 31, 2012 Convertible Notes [Member] 4.625 Percent Convertible Notes Due 2026 [Member]	Sep. 30, 2014 Convertible Notes [Member] 4.625 Percent Convertible Notes Due 2026 [Member]		Sep. 30, 2013 Convertible Notes [Member] 4.625 Percent Convertible Notes Due 2026 [Member]		Sep. 30, 2014 Convertible Notes [Member] 4.0 Percent Convertible Notes Due 2027 [Member]	Aug. 30, 2014 Convertible Notes [Member] 4.0 Percent Convertible Notes Due 2027 [Member]	Sep. 30, 2013 Convertible Notes [Member] 4.0 Percent Convertible Notes Due 2027 [Member]		Sep. 30, 2014 Convertible Notes [Member] 0.625 Percent Convertible Notes Due 2026 [Member]	Sep. 30, 2014 Convertible Notes [Member] Convertible Notes 2006 Member]	Sep. 30, 2014 Convertible Notes [Member] Convertible Notes 2007 [Member]	Sep. 30, 2014 Triggering Event One [Member] Convertible Notes [Member] D	Sep. 30, 2014 Triggering Event One [Member] Convertible Notes [Member] Convertible Notes 2013 [Member] D	Sep. 30, 2014 Triggering Event Two [Member] Convertible Notes [Member] Convertible Notes 2013 [Member] D
Debt Instrument [Line Items]
Debt instrument, face amount																	$ 250,000,000
Initial principal amount per note																	900
Face principal amount per note																	1,000
Debt Instrument, Convertible, Effective Interest Rate											7.00%	7.70%	10.90%							10.90%
Proceeds from Convertible Debt																	220,000,000
Equivalent Shares Of Common Stock Per 1000 Principal Amount Of Convertible Notes																	83.3333																47.6667	37.4111
Debt Instrument, Convertible, Conversion Price																	$ 12.00																$ 20.98	$ 26.73
Total amortization period for debt discount (in years):											10 years	12 years	8 years
Remaining amortization period for debt discount (in years):											2 years	5 years	6 years
Maximum Number Of Shares Of Common Stock Convertible Notes Are Convertible Into																																	3,000,000	6,000,000
Debt Instrument, Convertible, Threshold Trading Days														20																					5	20	5
Debt Instrument, Convertible, Threshold Consecutive Trading Days														30 days																					5 days	30 days	5 days
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger														120.00%																					97.00%	120.00%	97.00%
Repurchased amount of debt																							245,000,000
Long-term debt							162,000,000	[1]										229,000,000	[1]	227,000,000	[1]		300,000,000	55,000,000	[1]	55,000,000	[1]			200,000,000	[1]
Stated interest rate				7.875%		4.625%	4.00%																	4.625%				4.00%
Debt Instrument, Repurchase Amount																													38,000,000
Convertible note repurchase price																							236,000,000
Repurchase of convertible notes	31,000,000	24,000,000	0											5,000,000	5,000,000	0							5,000,000
Fair value of debt component																	216,000,000
Fair value of equity component																	9,000,000
Recognition Of Estimated Equity Component Ofconvertible Notes Before Tax																						108,000,000
Allocation Of Unamortized Debt Issuance Costs To Equity Component Reduction Of Paid In Capital																						4,000,000
Recognition Of Discount On Convertible Notes																						108,000,000
Deferred Tax Liabilities Conversion Of Equity Component Of Convertible Notes																						39,000,000
Convertible Notes Redemption Option Price																								100.00%				100.00%
Convertible Notes Repurchase Option Price																												100.00%				100.00%
Debt Instrument, Convertible, Carrying Amount of Equity Component									70,000,000	73,000,000
Unamortized discount on convertible notes	$ 52,000,000	$ 66,000,000		$ 21,000,000	$ 23,000,000									$ 31,000,000				$ 21,000,000

[1] The 4.625 percent, 4.0 percent and 7.875 percent convertible notes contain a put and call feature, which allows for earlier redemption beginning in 2016, 2019 and 2020, respectively.