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Share-Based Payments (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Share-Based Payments      
Common stock approved for issuance under share-based compensation plan (in shares) 29,800,000    
Share-based compensation expense (in dollars) $ 16,778 $ 22,107 $ 19,201
Total income tax benefit recognized (in dollars) 6,300 8,200 7,100
Accelerated expense related to certain retirement eligible employees (in dollars) $ 4,800 $ 8,800 $ 5,900
Stock Option Awards      
Share-Based Payments      
Vesting period 4 years    
Stock Options, Number of Outstanding Options      
Outstanding at the beginning of the period (in shares) 8,983,000    
Granted (in shares) 1,166,000 1,600,000 1,600,000
Exercised (in shares) (4,577,000)    
Forfeited or expired (in shares) (256,000)    
Outstanding at the end of the period (in shares) 5,316,000 8,983,000  
Exercisable at the end of the period (in shares) 2,710,000    
Stock Options, Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 15.93    
Granted (in dollars per share) 29.23    
Exercised (in dollars per share) 11.87    
Forfeited or expired (in dollars per share) 25.23    
Outstanding at the end of the period (in dollars per share) 21.89 $ 15.93  
Exercisable at the end of the period (in dollars per share) $ 18.48    
Stock Options, Weighted Average Remaining Contractual Term      
Outstanding at the beginning of the period 6 years 9 months 18 days 6 years 2 months 12 days  
Outstanding at the end of the period 6 years 9 months 18 days 6 years 2 months 12 days  
Exercisable at the end of the period 6 years    
Stock Options, Aggregate Intrinsic Value      
Outstanding at the beginning of the period (in dollars) $ 102,751    
Outstanding at the end of the period (in dollars) 19,255 $ 102,751  
Exercisable at the end of the period (in dollars) $ 17,361    
Stock Option Awards | Maximum      
Share-Based Payments      
Term of stock options 10 years    
Restricted Stock Awards      
Share-Based Payments      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 222,000 247,000 139,000
Restricted Stock Awards | Maximum      
Share-Based Payments      
Vesting period 5 years    
Restricted Stock Units      
Share-Based Payments      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 20,000 27,000 36,000
Vesting period 1 year    
Restricted Stock Units | Maximum      
Share-Based Payments      
Vesting period 1 year    
Executive management transition plan      
Share-Based Payments      
Accelerated expense related to certain retirement eligible employees (in dollars)   $ 3,500  
Executive management transition plan | Restricted Stock Awards      
Stock Options, Number of Outstanding Options      
Granted (in shares)   210,820,000  
Executive management transition plan | Restricted Stock Awards | Maximum      
Share-Based Payments      
Vesting period   4 years