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Stock-Based Employee Benefit Plans - Summary of Restricted Stock Unit and Performance Stock Unit Activity (Details) - $ / shares
shares in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Restricted stock units (RSUs)      
Shares      
Outstanding at September 30, 2019 (in shares) 721    
Granted (in shares) 182    
Released (in shares) (311)    
Forfeited (in shares) (75)    
Outstanding at September 30, 2020 (in shares) 517 721  
Weighted-average Grant-date Fair Value      
Outstanding at September 30, 2019 (in dollars per share) $ 229.10    
Granted (in dollars per share) 505.70 $ 356.66 $ 206.29
Released (in dollars per share) 197.53    
Forfeited (in dollars per share) 300.05    
Outstanding at September 30, 2020 (in dollars per share) $ 335.16 $ 229.10  
Performance stock units (PSUs)      
Shares      
Outstanding at September 30, 2019 (in shares) 127    
Granted (in shares) 67    
Released (in shares) (68)    
Outstanding at September 30, 2020 (in shares) 126 127  
Weighted-average Grant-date Fair Value      
Outstanding at September 30, 2019 (in dollars per share) $ 248.97    
Granted (in dollars per share) 506.91 $ 354.18 185.05
Released (in dollars per share) 217.36    
Outstanding at September 30, 2020 (in dollars per share) $ 403.61 $ 248.97  
Market stock units (MSUs)      
Shares      
Outstanding at September 30, 2019 (in shares) 63    
Granted (in shares) 67    
Released (in shares) (67)    
Outstanding at September 30, 2020 (in shares) 63 63  
Weighted-average Grant-date Fair Value      
Outstanding at September 30, 2019 (in dollars per share) $ 311.91    
Granted (in dollars per share) 471.16 $ 249.13 $ 169.46
Released (in dollars per share) 257.15    
Outstanding at September 30, 2020 (in dollars per share) $ 541.42 $ 311.91