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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Apr. 30, 2024
Jan. 31, 2024
Oct. 31, 2023
Jun. 30, 2020
Convertible Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Stated interest rate     1.50% 1.25%
Convertible Senior Notes | 2025 Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Stated interest rate 1.25%      
Convertible Senior Notes | 2028 Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Stated interest rate 1.50%      
Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Money market funds $ 332,259 $ 307,275    
Included in investments 210,242 208,178    
Total 542,501 515,453    
Recurring | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total 325,781 305,283    
Recurring | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total 216,720 210,170    
Recurring | Level 2 | 2025 Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of convertible senior notes 54,400      
Recurring | Level 2 | 2028 Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of convertible senior notes 402,300      
Recurring | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total 0 0    
U.S. Treasury securities | Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Included in investments 57,681 51,034    
U.S. Treasury securities | Recurring | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Included in investments 0 0    
U.S. Treasury securities | Recurring | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Included in investments 57,681 51,034    
U.S. Treasury securities | Recurring | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Included in investments 0 0    
Commercial paper | Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Included in investments 22,582 3,880    
Commercial paper | Recurring | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Included in investments 0 0    
Commercial paper | Recurring | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Included in investments 22,582 3,880    
Commercial paper | Recurring | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Included in investments 0 0    
Corporate debt securities | Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Included in investments 108,484 131,259    
Corporate debt securities | Recurring | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Included in investments 0 0    
Corporate debt securities | Recurring | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Included in investments 108,484 131,259    
Corporate debt securities | Recurring | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Included in investments 0 0    
U.S. Government agency securities | Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Included in investments 27,973 23,997    
U.S. Government agency securities | Recurring | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Included in investments 0 0    
U.S. Government agency securities | Recurring | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Included in investments 27,973 23,997    
U.S. Government agency securities | Recurring | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Included in investments 0 0    
Money market funds | Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Money market funds 325,781 305,283    
Money market funds | Recurring | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Money market funds 325,781 305,283    
Money market funds | Recurring | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Money market funds 0 0    
Money market funds | Recurring | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Money market funds $ 0 $ 0