Stock-based Compensation - Restricted Stock Unit Activities (Detail) - Restricted Stock Unit [Member]	6 Months Ended
	Jul. 31, 2024 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Unvested, beginning balance | shares	2,432,640
Shares, Granted | shares	639,240
Shares, Vested | shares	(594,910)
Shares, Forfeited | shares	(114,308)
Shares, Unvested, ending balance | shares	2,362,662
Weighted-Average Grant-Date Fair Value, Unvested, beginning balance | $ / shares	$ 82.54
Weighted-Average Grant-Date Fair Value, Granted | $ / shares	65.63
Weighted-Average Grant-Date Fair Value, Vested | $ / shares	75.11
Weighted-Average Grant-Date Fair Value, Forfeited | $ / shares	131.26
Weighted-Average Grant-Date Fair Value, Unvested, ending balance | $ / shares	$ 77.48