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Employee Benefits and Stock-based Compensation - Restricted Stock Unit Activities (Detail) - Restricted Stock Unit [Member] - $ / shares
 12 Months Ended
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares, Unvested, beginning balance 2,573,359 2,651,135 2,871,801
Shares, Granted 1,305,401 1,549,174 1,213,257
Shares, Vested (1,220,608) (1,513,972) (1,367,309)
Shares, Forfeited (225,512) (112,978) (66,614)
Shares, Unvested, ending balance 2,432,640 2,573,359 2,651,135
Weighted-Average Grant-Date Fair Value, Unvested, beginning balance $ 86.81 $ 85.41 $ 51.73
Weighted-Average Grant-Date Fair Value, Granted 70.32 74.45 128.8
Weighted-Average Grant-Date Fair Value, Vested 78.62 71.32 53.85
Weighted-Average Grant-Date Fair Value, Forfeited 81.79 99.46 71.59
Weighted-Average Grant-Date Fair Value, Unvested, ending balance $ 82.54 $ 86.81 $ 85.41