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Stock-Based Compensation - Restricted Stock Unit Activity (Details) - RSUs
shares in Thousands
 3 Months Ended
Jul. 31, 2022
$ / shares
shares
Number of RSUs  
Unvested Balance at beginning of period (in shares) | shares 12,109
RSUs granted (in shares) | shares 8,969
RSUs vested (in shares) | shares (1,841)
RSUs forfeited (in shares) | shares (1,630)
Unvested Balance at end of period (in shares) | shares 17,607
Weighted Average Grant Date Fair Value Per Share  
Unvested Balance at beginning of period (in dollars per share) | $ / shares $ 36.04
RSUs granted (in dollars per share) | $ / shares 17.84
RSUs vested (in dollars per share) | $ / shares 30.59
RSUs forfeited (in dollars per share) | $ / shares 36.11
Unvested Balance at end of period (in dollars per share) | $ / shares $ 27.29