Stock-based Compensation - Restricted Stock Unit Activities (Detail) - Restricted Stock Unit [Member]	3 Months Ended
	Apr. 30, 2025 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Unvested, beginning balance | shares	2,645,379
Shares, Granted | shares	501,725
Shares, Vested | shares	(362,141)
Shares, Forfeited | shares	(144,799)
Shares, Unvested, ending balance | shares	2,640,164
Weighted-Average Grant-Date Fair Value, Unvested, beginning balance | $ / shares	$ 71.84
Weighted-Average Grant-Date Fair Value, Granted | $ / shares	67.13
Weighted-Average Grant-Date Fair Value, Vested | $ / shares	71.78
Weighted-Average Grant-Date Fair Value, Forfeited | $ / shares	95.19
Weighted-Average Grant-Date Fair Value, Unvested, ending balance | $ / shares	$ 69.68