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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, 2021
USD ($)
$ / shares
shares
Shares (in thousands)  
Outstanding at beginning of period (in shares) | shares 3,404
Granted (in shares) | shares 196
Exercised (in shares) | shares (985)
Forfeited (in shares) | shares (118)
Canceled (in shares) | shares (1)
Outstanding at end of period (in shares) | shares 2,496
Exercisable (in shares) | shares 1,470
Wtd. Avg. Exercise Price  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 164.81
Granted (in dollars per share) | $ / shares 246.87
Exercised (in dollars per share) | $ / shares 156.98
Forfeited (in dollars per share) | $ / shares 191.64
Canceled (in dollars per share) | $ / shares 191.15
Outstanding at end of period (in dollars per share) | $ / shares 173.07
Exercisable (in dollars per share) | $ / shares $ 155.05
Wtd. Avg. Remaining Contractual Term (years)  
Outstanding at end of period 6 years 7 months 6 days
Exercisable 5 years 7 months 6 days
Aggregate Intrinsic Value of In-The-Money Options (in millions)  
Outstanding at end of period | $ $ 302.0
Exercisable | $ $ 204.3