Stockholders’ Equity and Equity Incentive Plans - Summary of Restricted Stock Units Activity Under Equity Incentive Plan (Details) - RSUs	9 Months Ended
	Oct. 31, 2021 $ / shares shares
Unvested RSUs
Beginning balance (in shares) | shares	4,510,730
Granted (in shares) | shares	2,046,653
Vested (in shares) | shares	(1,480,536)
Cancelled/forfeited (in shares) | shares	(233,344)
Ending balance (in shares) | shares	4,843,503
Weighted- Average Grant Date Fair Value Per Share
Beginning balance (in dollars per share) | $ / shares	$ 194.57
Granted (in dollars per share) | $ / shares	312.71
Vested (in dollars per share) | $ / shares	187.38
Cancelled/forfeited (in dollars per share) | $ / shares	248.84
Ending balance (in dollars per share) | $ / shares	$ 244.07