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Share-based Payments (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
 3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Compensation expense      
Recognized compensation expense $ 21,500 $ 62,300  
Accelerated equity award   43,900  
Accelerated settlement Of Common Stock   17,600  
Award settlement Of Cash   26,300  
Unrecognized compensation expense $ 176,400   $ 115,500
Vesting period 3 years    
Excess tax benefit from share-based payment $ 3,324 $ 2,526  
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) 23.94 26.24  
Balance at the end of the period (in dollars per share) 28.92 27.75  
Vested and expected to vest in the future at the end of the period (in dollars per share) $ 28.92 27.75  
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 32.38  
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) $ 29.92 $ 31.06