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Stock-based Compensation - Restricted Stock Unit Activities (Detail) - Restricted Stock Unit [Member]
 6 Months Ended
Jul. 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 436,857
Shares, Vested | shares (698,757)
Shares, Forfeited | shares (80,406)
Shares, Unvested, ending balance | shares 2,231,053
Weighted-Average Grant-Date Fair Value, Unvested, beginning balance | $ / shares $ 86.81
Weighted-Average Grant-Date Fair Value, Granted | $ / shares 88.36
Weighted-Average Grant-Date Fair Value, Vested | $ / shares 77.6
Weighted-Average Grant-Date Fair Value, Forfeited | $ / shares 71.15
Weighted-Average Grant-Date Fair Value, Unvested, ending balance | $ / shares $ 90.57