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Share-based Payments (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Compensation expense      
Recognized compensation expense $ 42,000 $ 77,900  
Accelerated equity award   43,900  
Accelerated settlement Of Common Stock 17,600    
Award settlement Of Cash 26,300    
Unrecognized compensation expense $ 143,000   $ 115,500
Vesting period 3 years    
Excess tax benefit from share-based payment $ 3,335 $ 2,560  
Employee Stock Option      
Number of Options      
Balance at the beginning of the period (in shares) 1.3 1.6  
Exercised (in shares) (0.2) (0.1)  
Balance at the end of the period (in shares) 1.1 1.5  
Vested and expected to vest in the future at the end of the period (in shares) 1.1 1.5  
Stock options, Weighted Average Exercise Price      
Balance at the beginning of the period (in dollars per share) $ 28.26 $ 27.69  
Exercised (in dollars per share) 23.36 25.82  
Cancelled (in dollars per share)   27.08  
Balance at the end of the period (in dollars per share) 29.44 27.89  
Vested and expected to vest in the future at the end of the period (in dollars per share) $ 29.44 27.89  
Performance Earnings Program      
Compensation expense      
Vesting period 3 years    
Weighted average grant-date fair value of stock options granted (in dollars per share) $ 29.92 32.32  
Restricted Stock Units (RSUs)      
Compensation expense      
Granted (in shares) 2.6    
Granted (in dollars per share) $ 30.04    
Weighted average grant-date fair value of stock options granted (in dollars per share) $ 29.80 $ 31.02