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Share-Based Compensation - Summary of Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Shares (in thousands)  
Outstanding at beginning of period (in shares) | shares 4,298
Granted (in shares) | shares 974
Exercised (in shares) | shares (1,784)
Forfeited (in shares) | shares (77)
Canceled (in shares) | shares (7)
Outstanding at end of period (in shares) | shares 3,404
Vested or expected to vest (in shares) | shares 2,115
Exercisable (in shares) | shares 1,606
Wtd. Avg. Exercise Price  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 139.53
Granted (in dollars per share) | $ / shares 195.90
Exercised (in dollars per share) | $ / shares 120.09
Forfeited (in dollars per share) | $ / shares 181.58
Canceled (in dollars per share) | $ / shares 170.82
Outstanding at end of period (in dollars per share) | $ / shares 164.81
Vested or expected to vest (in dollars per share) | $ / shares 141.77
Exercisable (in dollars per share) | $ / shares $ 139.70
Wtd. Avg. Remaining Contractual Term (years)  
Outstanding at end of period 7 years 2 months 12 days
Vested or expected to vest 5 years 9 months 18 days
Exercisable 5 years 8 months 12 days
Aggregate Intrinsic Value of In-The-Money Options (in millions)  
Outstanding at end of period | $ $ 190.2
Vested or expected to vest | $ 166.9
Exercisable | $ $ 130.0