Stockholders’ Equity and Equity Incentive Plans - Summary of Restricted Stock Units Activity Under Equity Incentive Plan (Details) - RSUs	6 Months Ended
	Jul. 31, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance (in shares) | shares	4,510,730
Granted (in shares) | shares	893,277
Vested (in shares) | shares	(1,182,958)
Cancelled/forfeited (in shares) | shares	(129,309)
Ending balance (in shares) | shares	4,091,740
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning balance (in dollars per share) | $ / shares	$ 194.57
Granted (in dollars per share) | $ / shares	347.05
Vested (in dollars per share) | $ / shares	180.43
Cancelled/forfeited (in dollars per share) | $ / shares	245.34
Ending balance (in dollars per share) | $ / shares	$ 230.34