v3.26.1
Fair Value Measurements - Schedule of Financial Assets and Liabilities (Details) - Fair Value, Recurring - USD ($)
$ in Thousands
Apr. 30, 2026
Jan. 31, 2026
Short-term investments:    
Total financial assets $ 1,729,719 $ 1,685,388
Level 1    
Short-term investments:    
Total financial assets 1,729,719 1,685,388
Level 2    
Short-term investments:    
Total financial assets 0 0
Level 3    
Short-term investments:    
Total financial assets 0 0
U.S. government treasury securities    
Short-term investments:    
Short-term investments: 1,390,799 1,303,701
U.S. government treasury securities | Level 1    
Short-term investments:    
Short-term investments: 1,390,799 1,303,701
U.S. government treasury securities | Level 2    
Short-term investments:    
Short-term investments: 0 0
U.S. government treasury securities | Level 3    
Short-term investments:    
Short-term investments: 0 0
Money market funds    
Cash and cash equivalents:    
Cash and cash equivalents: 338,920 381,687
Money market funds | Level 1    
Cash and cash equivalents:    
Cash and cash equivalents: 338,920 381,687
Money market funds | Level 2    
Cash and cash equivalents:    
Cash and cash equivalents: 0 0
Money market funds | Level 3    
Cash and cash equivalents:    
Cash and cash equivalents: $ 0 $ 0