LONG-TERM DEBT - Senior Subordinated Notes (Details) (USD $)	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013 Senior Subordinated Notes 2004 7 1/8% Senior Subordinated Notes	Sep. 30, 2013 Senior Subordinated Notes 2004 7 1/8% Senior Subordinated Notes	Mar. 06, 2012 Senior Subordinated Notes 2004 7 1/8% Senior Subordinated Notes	Aug. 31, 2004 Senior Subordinated Notes 2004 7 1/8% Senior Subordinated Notes	Dec. 31, 2013 Senior Subordinated Notes 2005 6 7/8% Senior Subordinated Notes	Sep. 30, 2013 Senior Subordinated Notes 2005 6 7/8% Senior Subordinated Notes	Mar. 06, 2012 Senior Subordinated Notes 2005 6 7/8% Senior Subordinated Notes	Feb. 28, 2005 Senior Subordinated Notes 2005 6 7/8% Senior Subordinated Notes	Dec. 31, 2013 Senior Subordinated Notes 2012 11 % Senior Subordinated Notes	Sep. 30, 2013 Senior Subordinated Notes 2012 11 % Senior Subordinated Notes	Aug. 31, 2013 Senior Subordinated Notes 2012 11 % Senior Subordinated Notes	Mar. 06, 2012 Senior Subordinated Notes 2012 11 % Senior Subordinated Notes	Mar. 06, 2012 Senior Subordinated Notes 2012 11 % Senior Subordinated Notes 2004 Senior Subordinated Notes	Mar. 06, 2012 Senior Subordinated Notes 2012 11 % Senior Subordinated Notes 2005 Senior Subordinated Notes	Aug. 31, 2013 Senior Unsecured Notes 2012 11 % Senior Subordinated Notes
Debt Instrument [Line Items]
Loan face amount						$ 225,000,000.0				$ 150,000,000.0				$ 344,200,000
Note stated interest rate			7.125%			7.125%	6.875%			6.875%	11.00%		11.00%	11.00%
Principal amount tendered and exchanged					203,800,000				140,300,000						203,800,000	140,300,000
Debt outstanding	1,745,491,000	1,682,312,000	21,156,000	21,156,000			9,654,000	9,654,000			271,180,000	271,022,000
Accrued interest	32,634,000	23,296,000	565,000	188,000			249,000	83,000			8,900,000	1,300,000
Redeemable rate before cutoff														100.00%
Redeemable rate after cutoff														101.00%
Redeemable rate upon certain conditions														100.00%
Payment in Kind (PIK) interest rate														2.00%
Repurchase amount													69,000,000				69,000,000
Notes payable											$ 275,200,000