Stockholders' Equity - Summary of Restricted Stock Unit (RSU) Activity (Detail) - Restricted Stock Units (RSUs)	9 Months Ended
	Oct. 31, 2022 $ / shares shares
Unreleased restricted stock units
Beginning balance (in shares) | shares	619,388
RSUs granted (in shares) | shares	1,495,425
RSUs vested (in shares) | shares	(702,297)
RSUs forfeited/cancelled (in shares) | shares	(84,017)
Ending balance (in shares) | shares	1,328,499
Weighted  average grant date fair value
Beginning balance (in usd per share) | $ / shares	$ 175.23
RSUs granted (in usd per share) | $ / shares	205.95
RSUs vested (in usd per share) | $ / shares	197.62
RSUs forfeited/cancelled (in usd per share) | $ / shares	199.28
Ending balance (in usd per share) | $ / shares	$ 196.43