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Stockholders' Equity - Restricted Stock Unit Activity and Related Share-Based Compensation Expense (Details) - Restricted Stock Units (RSUs) - USD ($)
$ / shares in Units, $ in Billions
 9 Months Ended
Dec. 03, 2020
Apr. 30, 2021
Number of Shares    
Nonvested at beginning of period (in shares)   5,664,000
Assumed through acquisition (in shares)   1,998,000
Granted (in shares)   1,793,000
Restricted stock awards subject to revest provisions issued in connection with acquisition (in shares)   775,000
Vested (in shares)   (1,486,000)
Forfeited (in shares)   (878,000)
Nonvested at end of period (in shares)   7,866,000
Weighted Average Grant Date Fair Value    
Nonvested, weighted average grant date fair value, at beginning of period (in dollars per shares)   $ 231.97
Assumed through acquisition, weighted average grant date fair value (in dollars per shares)   355.49
Granted, weighted average grant date fair value (in dollars per shares)   376.34
Restricted stock awards subject to revest provisions issued in connection with acquisition, weighted average grant date fair value (in dollars per share)   355.49
Vested, weighted average grant date fair value (in dollars per shares)   244.57
Forfeited, weighted average grant date fair value (in dollars per shares)   240.99
Nonvested, weighted average grant date fair value, at end of period (in dollars per shares)   $ 305.03
Unrecognized compensation cost related to non-vested RSUs   $ 2.1
Weighted average vesting period, in years   2 years 9 months 18 days
Credit Karma    
Number of Shares    
Assumed through acquisition (in shares) 1,997,881  
Granted (in shares)   809,000