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Debt and Lines of Credit - Additional Information (Details)
3 Months Ended
Oct. 12, 2018
USD ($)
Apr. 30, 2022
USD ($)
Subsidiary
Bank
Apr. 30, 2021
USD ($)
Subsidiary
Bank
Apr. 30, 2022
CHF (SFr)
Subsidiary
Bank
Jan. 31, 2022
USD ($)
Apr. 30, 2021
CHF (SFr)
Bank
Subsidiary
Debt Instrument [Line Items]            
Cash paid for interest   $ 100,000 $ 200,000      
Cash and cash equivalents   225,256,000 186,950,000   $ 277,128,000  
Unsecured Debt | Swiss subsidiary            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity   6,700,000 7,100,000 SFr 6,500,000   SFr 6,500,000
Outstanding borrowing amount   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 $ 100,000,000.0          
Uncommitted increase to borrowing capacity $ 50,000,000.0          
Credit facility matures date Oct. 28, 2026          
Loan drawn under the facility   0 10,000,000.0     SFr 0
Line of credit facility remaining borrowing capacity   99,700,000 89,700,000      
Weighted average borrowings amount   $ 0 $ 13,100,000      
Weighted average interest rate     3.21%      
Letter of Credit            
Debt Instrument [Line Items]            
Credit facility matures date   May 31, 2022        
Outstanding borrowing amount   $ 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 $ 15,000,000.0          
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
Number of foreign subsidiaries under guaranteed obligation | Subsidiary   2 2 2   2
Guaranteed obligations to third parties   $ 1,200,000 $ 1,300,000      
Restricted deposit relates to lease agreement   $ 600,000 $ 600,000      
Swingline | Secured Debt | Credit Agreement Due on October 28, 2026            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity 25,000,000.0          
Swiss Borrowers | Secured Debt | Credit Agreement Due on October 28, 2026            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity $ 75,000,000.0