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Stockholders' Equity - Restricted Stock Units Activity (Details) - Restricted Stock Units
 9 Months Ended
Oct. 31, 2023
$ / shares
shares
Number of Shares  
Beginning Balance (in shares) | shares 14,099,000
RSUs granted (in shares) | shares 8,472,000
RSUs vested (in shares) | shares (5,179,000)
RSUs forfeited (in shares) | shares (1,269,000)
Ending Balance (in shares) | shares 16,123,000
Weighted-Average Grant Date Fair Value  
Beginning Balance (in dollars per share) | $ / shares $ 206.38
RSUs granted (in dollars per share) | $ / shares 193.86
RSUs vested (in dollars per share) | $ / shares 202.76
RSUs forfeited (in dollars per share) | $ / shares 203.10
Ending Balance (in dollars per share) | $ / shares $ 201.22