Stock-based Compensation - Restricted Stock Unit Activities (Detail) - Restricted Stock Unit [Member]	3 Months Ended
	Apr. 30, 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	604,990
Shares, Vested | shares	(335,348)
Shares, Forfeited | shares	(89,977)
Shares, Unvested, ending balance | shares	2,612,305
Weighted-Average Grant-Date Fair Value, Unvested, beginning balance | $ / shares	$ 82.54
Weighted-Average Grant-Date Fair Value, Granted | $ / shares	66.21
Weighted-Average Grant-Date Fair Value, Vested | $ / shares	73.44
Weighted-Average Grant-Date Fair Value, Forfeited | $ / shares	148.33
Weighted-Average Grant-Date Fair Value, Unvested, ending balance | $ / shares	$ 77.66