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Cash Equivalents and Short-Term Investments - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Oct. 31, 2024
Oct. 31, 2023
Jan. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Interest and investment income $ 12,600 $ 10,900 $ 37,400 $ 27,300  
Net amortization of premiums or discounts on short-term investments 3,800 5,900 12,933 14,361  
Contingent consideration liability, current 641   641   $ 3,608
Change in fair value of acquisition related contingent consideration     3,750 0  
Accretion expense 100 0 100 100  
Opstrace Inc.          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Change in fair value of acquisition related contingent consideration 0 $ 0 3,800 $ 0  
Payment for contingent consideration liability, operating activities 6,900        
Fair Value, Inputs, Level 3 | Opstrace Inc.          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent payment $ 600   $ 600   $ 3,600