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Share-Based Payments (Details 4) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Restricted Stock Awards
     
Summary of the activity for restricted stock awards/restricted stock units, Number of Shares      
Unvested at the beginning of the period (in shares) 337,000    
Granted (in shares) 247,000 139,000 32,000
Vested (in shares) (115,000)    
Forfeited (in shares) (33,000)    
Unvested at the end of the period (in shares) 436,000 337,000  
Restricted stock awards/restricted stock units      
Unvested at the beginning of the period (in dollars per share) $ 16.30    
Granted (in dollars per share) $ 26.57    
Vested (in dollars per share) $ 13.81    
Forfeited (in dollars per share) $ 21.10    
Unvested at the end of the period (in dollars per share) $ 22.42 $ 16.30  
Weighted average remaining vesting term 3 years 4 months 24 days 3 years 1 month 6 days  
Total unrecognized compensation costs $ 3.4    
Weighted average period for recognition of unvested restricted awards 3 years 4 months 24 days    
Restricted Stock Awards | Executive management transition plan
     
Stock Awards      
Granted (in shares) 210,820,000    
Restricted Stock Awards | Minimum
     
Stock Awards      
Vesting period 4 years    
Restricted Stock Awards | Minimum | Executive management transition plan
     
Stock Awards      
Vesting period 3 years    
Restricted Stock Awards | Maximum
     
Stock Awards      
Vesting period 5 years    
Restricted Stock Awards | Maximum | Executive management transition plan
     
Stock Awards      
Vesting period 4 years    
Restricted Stock Units
     
Stock Awards      
Vesting period 1 year    
Summary of the activity for restricted stock awards/restricted stock units, Number of Shares      
Granted (in shares) 27,000 36,000 26,000
Vested (in shares) (27,000)    
Restricted stock awards/restricted stock units      
Granted (in dollars per share) $ 26.30    
Vested (in dollars per share) $ 26.30    
Total unrecognized compensation costs $ 0    
Restricted stock units, retention period 6 months    
Restricted Stock Units | Maximum
     
Stock Awards      
Vesting period 1 year