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Temporary Equity - Additional Information (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
12 Months Ended 3 Months Ended 12 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Apr. 01, 2012
Aug. 05, 2011
May 13, 2011
May 13, 2011
Series A Preferred Stock [Member]
Aug. 05, 2011
Series A Redeemable Convertible Preferred Stock
May 13, 2011
Series A Redeemable Convertible Preferred Stock
Jun. 30, 2014
Common Stock
Sep. 30, 2014
Common Stock
Sep. 30, 2013
Common Stock
Sep. 30, 2014
Series A-2 Redeemable Convertible Preferred Stock
Sep. 30, 2013
Series A-2 Redeemable Convertible Preferred Stock
Aug. 05, 2011
Series A-2 Redeemable Convertible Preferred Stock
May 13, 2011
Series A-2 Redeemable Convertible Preferred Stock
May 13, 2011
Scenario NAV Threshold 3 [Member]
May 13, 2011
Scenario NAV Threshold 2 [Member]
May 13, 2011
Scenario NAV Threshold 1 [Member]
Jun. 30, 2014
Gain loss upon conversion of convertible preferred stock [Member]
Temporary Equity [Line Items]                                        
Temporary equity, shares issued             280 120               95        
Preferred Stock, Value, Outstanding         $ 400.0                              
Preferred stock conversion price (in dollars per share)                 $ 6.50           $ 7.00          
Temporary equity liquidation preference, minimum threshold rate           150.00%                            
Preferred stock, dividend rate 8.00%                                      
Preferred stock, paid in kind dividend rate     0.00% 2.00%   4.00%                     0.00% 2.00% 4.00%  
Shares converted at conversion                         19 6            
Shares issued at conversion                   59,134 2,900 852                
Carrying value of Preferred Stock    329.4                                    
Less: Preferred stock dividends, accretion and loss on conversion $ 73.6 $ 48.4 $ 59.6                                 $ 43.9