LONG-TERM DEBT - Senior Subordinated Notes (Details) (USD $)	Jun. 30, 2014	Sep. 30, 2013	Jun. 30, 2014 Senior Subordinated Notes 2004 7 1/8% Senior Subordinated Notes	Sep. 30, 2013 Senior Subordinated Notes 2004 7 1/8% Senior Subordinated Notes	Mar. 31, 2012 Senior Subordinated Notes 2004 7 1/8% Senior Subordinated Notes	Aug. 31, 2004 Senior Subordinated Notes 2004 7 1/8% Senior Subordinated Notes	Jun. 30, 2014 Senior Subordinated Notes 2005 6 7/8% Senior Subordinated Notes	Sep. 30, 2013 Senior Subordinated Notes 2005 6 7/8% Senior Subordinated Notes	Mar. 31, 2012 Senior Subordinated Notes 2005 6 7/8% Senior Subordinated Notes	Feb. 28, 2005 Senior Subordinated Notes 2005 6 7/8% Senior Subordinated Notes	Jun. 30, 2014 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. 31, 2012 Senior Subordinated Notes 2012 11 % Senior Subordinated Notes	Mar. 31, 2012 Senior Subordinated Notes 2012 11 % Senior Subordinated Notes 2004 Senior Subordinated Notes	Mar. 31, 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				$ 344,200,000.0
Note stated interest rate			7.125%	7.125%		7.125%	6.875%	6.875%		6.875%	11.00%	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			21,200,000				9,700,000
Accrued interest payable	31,005,000	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%
Debt Instrument, Repurchase Amount													69,000,000				69,000,000
Notes Payable											$ 275,200,000