LONG-TERM DEBT - Senior Secured Notes (Details) (USD $)	0 Months Ended
	Mar. 06, 2012	Sep. 30, 2012	Sep. 30, 2011	Oct. 31, 2009
Debt Instrument [Line Items]
Debt outstanding		$ 1,697,415,000	$ 1,629,775,000
Accrued interest		46,362,000	28,580,000
Senior Secured Notes | 2009 11 1/2% Second Lien Senior Secured Notes
Debt Instrument [Line Items]
Loan face amount				200,000,000
Note stated interest rate		11.50%		11.50%
Issued at percent of par				96.234%
Initial yield per annum				12.25%
Debt extinguished	199,800,000
Debt outstanding before discount		200,000
Debt outstanding		194,000	193,675,000
Accrued interest		10,000	9,600,000
Senior Secured Notes | 2012 11 1/2% Second Lien Senior Secured Notes
Debt Instrument [Line Items]
Loan face amount	199,800,000
Note stated interest rate	11.50%	11.50%
Debt outstanding		194,213,000	0
Accrued interest		13,100,000
Redeemable rate before cutoff	100.00%
Redeemable rate after cutoff upon change of control	101.00%
Redeemable rate upon certain conditions	100.00%
Senior Secured Notes | 2012 10 1/2% Third Lien Senior Secured Notes
Debt Instrument [Line Items]
Loan face amount	417,700,000
Note stated interest rate	10.50%	10.50%
Debt outstanding		417,771,000	0
Accrued interest		25,000,000
Redeemable rate	100.00%
Redeemable rate after cutoff upon change of control	101.00%
Redeemable rate upon certain conditions	100.00%
Senior Secured Notes | 2005 Senior Unsecured Notes
Debt Instrument [Line Items]
Amount of debt repurchased	234,200,000
Senior Secured Notes | 2002 Senior Subordinated Notes
Debt Instrument [Line Items]
Amount of debt repurchased	$ 183,500,000