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Temporary Equity - Schedule of Temporary Equity (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Aug. 05, 2011
Sep. 30, 2013
Series A Redeemable Convertible Preferred Stock
Sep. 30, 2012
Series A Redeemable Convertible Preferred Stock
Sep. 30, 2011
Series A Redeemable Convertible Preferred Stock
May 13, 2011
Series A Redeemable Convertible Preferred Stock
Sep. 30, 2013
Series A-2 Redeemable Convertible Preferred Stock
Sep. 30, 2012
Series A-2 Redeemable Convertible Preferred Stock
Sep. 30, 2011
Series A-2 Redeemable Convertible Preferred Stock
Aug. 05, 2011
Series A-2 Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]                        
Initial issuance price in Fiscal 2011       $ 400.0       $ 280.0       $ 120.0
Principal accretion 0 12.3 5.0   0 8.6 4.3   0 3.7 0.7  
Cumulative principal accretion 17.3       12.9       4.4      
Redemption value of preferred stock converted into common stock upon election of holder (5.9)       0       (5.9)      
Redemption value as of September 30, 2013 411.4       292.9       118.5      
Bifurcation of embedded conversion feature at issuance       (103.3)       (85.7)       (17.6)
Issuance costs       (14.1)       (11.1)       (3.0)
Accretion: 16.1 14.5 4.7   12.4 11.7 4.2   3.7 2.8 0.5  
Carrying value of Preferred Stock 329.4 319.2   282.6 224.4       104.9      
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests, excluding Temporary Equity Class B Common Stock Shares Issued Under the EXCO/HGI JV Incentive Plan $ 329.3