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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, 2024
USD ($)
$ / shares
shares
Shares (in thousands)  
Outstanding at beginning of period (in shares) | shares 1,924
Granted (in shares) | shares 229
Exercised (in shares) | shares (230)
Forfeited (in shares) | shares (36)
Canceled (in shares) | shares (3)
Outstanding at end of period (in shares) | shares 1,884
Exercisable (in shares) | shares 1,490
Wtd. Avg. Exercise Price  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 200.03
Granted (in dollars per share) | $ / shares 278.74
Exercised (in dollars per share) | $ / shares 169.74
Forfeited (in dollars per share) | $ / shares 278.42
Canceled (in dollars per share) | $ / shares 315.46
Outstanding at end of period (in dollars per share) | $ / shares 214.03
Exercisable (in dollars per share) | $ / shares $ 194.26
Wtd. Avg. Remaining Contractual Term (years)  
Outstanding at end of period 5 years 3 months 18 days
Exercisable 4 years 4 months 24 days
Aggregate Intrinsic Value of In-The-Money Options (in millions)  
Outstanding at end of period | $ $ 105.8
Exercisable | $ $ 110.5