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Debt and Lines of Credit - Additional Information (Details)
 3 Months Ended 9 Months Ended
Oct. 12, 2018
USD ($)
Oct. 31, 2025
USD ($)
Bank
Subsidiary
Oct. 31, 2024
USD ($)
Bank
Subsidiary
Oct. 31, 2025
USD ($)
Bank
Subsidiary
Oct. 31, 2024
USD ($)
Bank
Subsidiary
Oct. 31, 2025
CHF (SFr)
Subsidiary
Bank
Oct. 31, 2024
CHF (SFr)
Bank
Subsidiary
Debt Instrument [Line Items]              
Cash paid for interest       $ 200,000 $ 200,000    
Amortization of debt fees       200,000 200,000    
Unsecured Debt | Swiss subsidiary              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity   $ 8,100,000 $ 7,500,000 8,100,000 7,500,000 SFr 6,500,000 SFr 6,500,000
Outstanding borrowing amount   0 0 0 0    
Revolving Credit Facility | Secured Debt | Credit Agreement Due on October 28, 2026              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity $ 100,000,000            
Uncommitted increase to borrowing capacity $ 50,000,000            
Credit facility matures date Oct. 28, 2026            
Loan drawn under the facility   0 0 0 0    
Line of credit facility remaining borrowing capacity   99,700,000 99,700,000 99,700,000 99,700,000    
Weighted average borrowings amount   0 0 $ 0 0    
Letter of Credit              
Debt Instrument [Line Items]              
Credit facility matures date       Jun. 01, 2026      
Outstanding borrowing amount   $ 300,000 $ 300,000 $ 300,000 $ 300,000    
Letter of Credit | Secured Debt | Credit Agreement Due on October 28, 2026              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity $ 15,000,000            
Letter of Credit | Unsecured Debt | Swiss subsidiary              
Debt Instrument [Line Items]              
Number of European banks guaranteed obligations to third parties | Bank   2 2 2 2 2 2
Number of foreign subsidiaries under guaranteed obligation | Subsidiary   2 2 2 2 2 2
Guaranteed obligations to third parties   $ 1,500,000 $ 1,400,000 $ 1,500,000 $ 1,400,000    
Restricted deposit relates to lease agreement   $ 800,000 $ 800,000 $ 800,000 $ 800,000    
Swingline | Secured Debt | Credit Agreement Due on October 28, 2026              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity 25,000,000            
Swiss Borrowers | Secured Debt | Credit Agreement Due on October 28, 2026              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity $ 75,000,000