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Share-Based Compensation - Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2018
Sep. 30, 2020
Sep. 30, 2019
Options        
Outstanding, beginning of period (shares)     7,659  
Granted (shares)     383  
Exercised (shares)     (2,242)  
Forfeited (shares)     (166)  
Expired (shares)     (75)  
Outstanding, end of period (shares) 5,559   5,559  
Exercisable, end of period (shares) 3,430   3,430  
Expected to vest after end of period (shares) 2,072   2,072  
Weighted Average Exercise Price        
Outstanding, beginning of period (usd per share)     $ 83  
Granted (usd per share)     86  
Exercised (usd per share)     76  
Forfeited (usd per share)     83  
Expired (usd per share)     95  
Outstanding, end of period (usd per share) $ 86   86  
Exercisable, end of period (usd per share) 88   88  
Expected to vest after end of period (usd per share) $ 83   $ 83  
Weighted Average Remaining Contractual Term        
Outstanding 3 years 4 years    
Exercisable 2 years      
Expected to vest after end of period 5 years      
Aggregate Intrinsic Value        
Outstanding $ 62,770   $ 62,770 $ 35,319
Exercisable 33,107   33,107  
Expected to vest after end of period $ 29,032   $ 29,032