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Common Stock and Stock Compensation - Restricted Stock Award Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Restricted Stock and Phantom Share-Based Awards [Member]      
Weighted Average Grant date Fair Value      
Granted (in dollars per share) $ 5.69    
Weighted average grant-date fair value per share granted (in dollars per share) $ 5.69    
Total grant date fair value of RSAs vested $ 1.8 $ 7.6 $ 10.7
Restricted Stock [Member]      
Shares      
Outstanding, beginning balance, shares 685,551    
Granted, shares 94,000    
Released, shares (132,412)    
Forfeited, shares (63,978)    
Outstanding, ending balance, shares 583,161.000 685,551  
Weighted Average Grant date Fair Value      
Outstanding, beginning balance (in dollars per share) $ 19.82    
Granted (in dollars per share) 10.34 $ 14.58 $ 20.43
Released (in dollars per share) 14.03    
Forfeited (in dollars per share) 20.79    
Outstanding, ending balance (in dollars per share) $ 18.94 19.82  
Shares withheld to satisfy related federal income tax withholding 22,000    
Weighted average grant-date fair value per share granted (in dollars per share) $ 10.34 $ 14.58 $ 20.43
Phantom Share-Based Awards [Member]      
Shares      
Outstanding, ending balance, shares 1,863,550