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Debt and Lines of Credit (Details Textual)
6 Months Ended
Jan. 30, 2015
USD ($)
Jul. 31, 2018
USD ($)
CreditFacility
Bank
Subsidiary
Jul. 31, 2018
CHF (SFr)
CreditFacility
Bank
Subsidiary
Jul. 31, 2017
USD ($)
Bank
Subsidiary
Jul. 31, 2017
CHF (SFr)
Bank
Subsidiary
Debt Instrument [Line Items]          
Number of issued standby letter of credit | CreditFacility   2 2    
Minimum          
Debt Instrument [Line Items]          
Consolidated Earnings Before Interest Tax Depreciation And Amortization   $ 50,000,000      
Secured Debt | Credit Agreement Due on January 30, 2020          
Debt Instrument [Line Items]          
Letter of credit outstanding amount   $ 300,000      
Secured Debt | Credit Agreement Due on January 30, 2020 | Maximum          
Debt Instrument [Line Items]          
Consolidated leverage ratio   250.00% 250.00%    
Unsecured Debt | Swiss subsidiary          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 6,600,000 SFr 6,500,000 $ 6,700,000 SFr 6,500,000
Outstanding borrowing amount   0   $ 0  
Revolving Credit Facility | Secured Debt | Credit Agreement Due on January 30, 2020          
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 Jan. 30, 2020        
Loan drawn under the facility   0      
Line of credit facility remaining borrowing capacity   $ 99,700,000      
Revolving Credit Facility | Secured Debt | Credit Agreement Due on January 30, 2020 | LIBOR | Minimum          
Debt Instrument [Line Items]          
Applicable margin rate   1.25%      
Revolving Credit Facility | Secured Debt | Credit Agreement Due on January 30, 2020 | LIBOR | Maximum          
Debt Instrument [Line Items]          
Applicable margin rate   1.75%      
Revolving Credit Facility | Secured Debt | Credit Agreement Due on January 30, 2020 | Base Rate | Minimum          
Debt Instrument [Line Items]          
Applicable margin rate   0.25%      
Revolving Credit Facility | Secured Debt | Credit Agreement Due on January 30, 2020 | Base Rate | Maximum          
Debt Instrument [Line Items]          
Applicable margin rate   0.75%      
Letter of Credit          
Debt Instrument [Line Items]          
Credit facility matures date   May 31, 2019      
Outstanding borrowing amount   $ 300,000      
Letter of Credit | Secured Debt | Credit Agreement Due on January 30, 2020          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity $ 15,000,000        
Line 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   $ 1,200,000  
Restricted deposit relates to lease agreement   $ 600,000   $ 600,000