Equity Incentive Plans and Employee Stock Purchase Plan - Schedule of Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs)	9 Months Ended
	Oct. 31, 2021 $ / shares shares
Shares
Unvested - beginning of period (in shares) | shares	3,473,512
RSUs granted (in shares) | shares	1,422,325
RSUs vested (in shares) | shares	(1,070,507)
RSUs forfeited and canceled (in shares) | shares	(335,347)
Unvested - end of period (in shares) | shares	3,489,983
Weighted-Average Grant Date Fair Value per RSU
Unvested - beginning of period (in dollars per share) | $ / shares	$ 139.68
RSUs granted (in dollars per share) | $ / shares	386.88
RSUs vested (in dollars per share) | $ / shares	142.93
RSUs forfeited and canceled (in dollars per share) | $ / shares	182.95
Unvested - end of period (in dollars per share) | $ / shares	$ 235.27