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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, 2025
USD ($)
$ / shares
shares
Shares (in thousands)  
Outstanding at beginning of period (in shares) | shares 1,884
Granted (in shares) | shares 190
Exercised (in shares) | shares (571)
Forfeited (in shares) | shares (32)
Canceled (in shares) | shares (18)
Outstanding at end of period (in shares) | shares 1,453
Exercisable (in shares) | shares 1,085
Wtd. Avg. Exercise Price  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 214.03
Granted (in dollars per share) | $ / shares 297.07
Exercised (in dollars per share) | $ / shares 177.76
Forfeited (in dollars per share) | $ / shares 279.45
Canceled (in dollars per share) | $ / shares 335.27
Outstanding at end of period (in dollars per share) | $ / shares 233.92
Exercisable (in dollars per share) | $ / shares $ 216.77
Wtd. Avg. Remaining Contractual Term (years)  
Outstanding at end of period 5 years 3 months 18 days
Exercisable 4 years 2 months 12 days
Aggregate Intrinsic Value of In-The-Money Options (in millions)  
Outstanding at end of period | $ $ 168.0
Exercisable | $ $ 144.0