Stock-based Compensation - Restricted Stock Unit Activities (Detail) - Restricted Stock Unit [Member]	9 Months Ended
	Oct. 31, 2023 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Unvested, beginning balance | shares	2,573,359
Shares, Granted | shares	1,190,375
Shares, Vested | shares	(969,060)
Shares, Forfeited | shares	(128,201)
Shares, Unvested, ending balance | shares	2,666,473
Weighted-Average Grant-Date Fair Value, Unvested, beginning balance | $ / shares	$ 86.81
Weighted-Average Grant-Date Fair Value, Granted | $ / shares	71.77
Weighted-Average Grant-Date Fair Value, Vested | $ / shares	78.11
Weighted-Average Grant-Date Fair Value, Forfeited | $ / shares	76.31
Weighted-Average Grant-Date Fair Value, Unvested, ending balance | $ / shares	$ 83.76