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Stock-based Compensation - Restricted Stock Unit Activities (Detail) - Restricted Stock Unit [Member]
 6 Months Ended
Jul. 31, 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 551,855
Shares, Vested | shares (618,865)
Shares, Forfeited | shares (164,827)
Shares, Unvested, ending balance | shares 2,413,542
Weighted-Average Grant-Date Fair Value, Unvested, beginning balance | $ / shares $ 71.84
Weighted-Average Grant-Date Fair Value, Granted | $ / shares 65.86
Weighted-Average Grant-Date Fair Value, Vested | $ / shares 73.59
Weighted-Average Grant-Date Fair Value, Forfeited | $ / shares 91.56
Weighted-Average Grant-Date Fair Value, Unvested, ending balance | $ / shares $ 68.68