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Stockholders' Equity - Restricted Stock Unit and Restricted Stock Activity (Details) - Restricted Stock Units (RSUs)
$ / shares in Units, shares in Thousands, $ in Billions
 3 Months Ended
Oct. 31, 2022
USD ($)
$ / shares
shares
Number of Shares  
Nonvested at beginning of period (in shares) | shares 11,467
Granted (in shares) | shares 457
Vested (in shares) | shares (688)
Forfeited (in shares) | shares (370)
Nonvested at end of period (in shares) | shares 10,866
Weighted Average Grant Date Fair Value  
Nonvested, weighted average grant date fair value, at beginning of period (in dollars per shares) | $ / shares $ 413.32
Granted, weighted average grant date fair value (in dollars per shares) | $ / shares 434.39
Vested, weighted average grant date fair value (in dollars per shares) | $ / shares 359.72
Forfeited, weighted average grant date fair value (in dollars per shares) | $ / shares 265.76
Nonvested, weighted average grant date fair value, at end of period (in dollars per shares) | $ / shares $ 422.62
Unrecognized compensation cost related to non-vested RSUs | $ $ 4.0
Weighted average vesting period, in years 2 years 10 months 24 days