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Commitments and Contingencies (Details Textual)
6 Months Ended
Jul. 31, 2015
USD ($)
Bank
CreditFacility
Subsidiary
Jul. 31, 2014
USD ($)
Loss Contingencies [Line Items]    
Number of issued standby letter of credit | CreditFacility 4  
Unsecured Debt | Swiss subsidiary    
Loss Contingencies [Line Items]    
Outstanding borrowing amount $ 0 $ 0
Letter of Credit    
Loss Contingencies [Line Items]    
Outstanding borrowing amount $ 3,700,000  
Credit facility matures date May 31, 2016  
Line of Credit | Unsecured Debt | Swiss subsidiary    
Loss Contingencies [Line Items]    
Number of European banks guaranteed obligations to third parties | Bank 2  
Number of foreign subsidiaries under guaranteed obligation 2  
Guaranteed obligations to third parties $ 1,000,000