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Equity Plans and Stock-based Compensation - Restricted Stock Units Activity (Details) - Restricted stock units
 6 Months Ended
Jul. 31, 2024
$ / shares
shares
Number of Shares  
Outstanding, beginning balance (in shares) | shares 28,416,127
Granted (in shares) | shares 22,271,093
Vested (in shares) | shares (5,231,209)
Forfeited (in shares) | shares (4,428,242)
Outstanding, ending balance (in shares) | shares 41,027,769
Weighted Average Grant Date Fair Value per Share  
Outstanding, beginning balance (in dollars per share) | $ / shares $ 7.35
Granted (in dollars per share) | $ / shares 1.51
Vested (in dollars per share) | $ / shares 7.09
Forfeited (in dollars per share) | $ / shares 9.77
Outstanding, ending balance (in dollars per share) | $ / shares $ 3.95