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Stock Compensation - Restricted Stock Award Activity (Details) - USD ($)
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Restricted Stock and Phantom Share-Based Awards [Member]      
Weighted Average Grant date Fair Value      
Granted (usd per share) $ 5.69    
Weighted average grant-date fair value per share granted (usd per share) $ 5.69    
Total grant date fair value of RSAs vested $ 2,300,000 $ 1,800,000 $ 7,600,000
Restricted stock      
Shares      
Outstanding, beginning balance (shares) 583,161    
Granted (shares) 1,612,062    
Other (shares) 1,701,750    
Released (shares) (459,653)    
Modified (shares) (720,000)    
Forfeited (Shares) (305,820)    
Outstanding, ending balance (shares) 2,411,500.0 583,161  
Weighted Average Grant date Fair Value      
Outstanding, beginning balance (usd per share) $ 18.94    
Granted (usd per share) 3.53 $ 10.34 $ 14.58
Other (usd per share) 5.53    
Released (usd per share) 6.76    
Modified (usd per share) 4.74    
Forfeited (usd per share) 16.07    
Outstanding, ending balance (usd per share) $ 5.77 18.94  
Shares withheld to satisfy related federal income tax withholding (shares) 36,598    
Weighted average grant-date fair value per share granted (usd per share) $ 3.53 $ 10.34 $ 14.58
Phantom stock      
Shares      
Granted (shares) 1,863,550    
Weighted Average Grant date Fair Value      
Accrued liabilities   $ 3,900,000.0