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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, 2022
USD ($)
$ / shares
shares
Shares (in thousands)  
Outstanding at beginning of period (in shares) | shares 2,496
Granted (in shares) | shares 164
Exercised (in shares) | shares (363)
Forfeited (in shares) | shares (48)
Canceled (in shares) | shares (3)
Outstanding at end of period (in shares) | shares 2,246
Exercisable (in shares) | shares 1,717
Wtd. Avg. Exercise Price  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 173.07
Granted (in dollars per share) | $ / shares 350.75
Exercised (in dollars per share) | $ / shares 159.50
Forfeited (in dollars per share) | $ / shares 241.22
Canceled (in dollars per share) | $ / shares 221.49
Outstanding at end of period (in dollars per share) | $ / shares 186.72
Exercisable (in dollars per share) | $ / shares $ 166.64
Wtd. Avg. Remaining Contractual Term (years)  
Outstanding at end of period 6 years
Exercisable 5 years 3 months 18 days
Aggregate Intrinsic Value of In-The-Money Options (in millions)  
Outstanding at end of period | $ $ 90.0
Exercisable | $ $ 84.9