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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, 2019
USD ($)
$ / shares
shares
Shares (in thousands)  
Outstanding shares, beginning balance (in shares) | shares 3,914
Granted (in shares) | shares 969
Exercised (in shares) | shares (481)
Forfeited (in shares) | shares (91)
Canceled (in shares) | shares (13)
Outstanding shares, ending balance (in shares) | shares 4,298
Vested or expected to vest (in shares) | shares 3,129
Exercisable (in shares) | shares 2,520
Wtd. Avg. Exercise Price  
Outstanding, beginning balance (in dollars per share) | $ / shares $ 127.50
Granted (in dollars per share) | $ / shares 171.15
Exercised (in dollars per share) | $ / shares 98.43
Forfeited (in dollars per share) | $ / shares 171.53
Canceled (in dollars per share) | $ / shares 173.07
Outstanding, ending balance (in dollars per share) | $ / shares 139.53
Vested or expected to vest (in dollars per share) | $ / shares 115.01
Exercisable (in dollars per share) | $ / shares $ 116.75
Wtd. Avg. Remaining Contractual Term (years)  
Outstanding at end of period 6 years 8 months 12 days
Vested or expected to vest 5 years 4 months 24 days
Exercisable 5 years 6 months
Aggregate Intrinsic Value of In-The-Money Options (in millions)  
Outstanding at end of period | $ $ 108.6
Vested or expected to vest | $ 155.8
Exercisable | $ $ 121.1