Stockholders' Equity - Summary of Restricted Stock Unit (RSU) Activity (Detail) - Restricted Stock Units (RSUs)	6 Months Ended
	Jul. 31, 2022 $ / shares shares
Unreleased restricted stock units
Beginning balance (in shares) | shares	619,388
RSUs granted (in shares) | shares	1,458,211
RSUs vested (in shares) | shares	(438,850)
RSUs forfeited/cancelled (in shares) | shares	(57,622)
Ending balance (in shares) | shares	1,581,127
Weighted  average grant date fair value
Beginning balance (in usd per share) | $ / shares	$ 175.23
RSUs granted (in usd per share) | $ / shares	206.38
RSUs vested (in usd per share) | $ / shares	200.73
RSUs forfeited/cancelled (in usd per share) | $ / shares	197.05
Ending balance (in usd per share) | $ / shares	$ 196.09