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Derivative Financial Instruments (Details Textual) - 12 months ended Jan. 31, 2017
$ in Millions
USD ($)
CHF (SFr)
EUR (€)
GBP (£)
Derivatives Fair Value [Line Items]        
Maximum length of time hedged in cash flow hedge 24 months      
Net change in effective portion of hedging contracts $ 0.4      
Net change in effective portion of hedging contracts, tax $ 0.1      
Foreign Exchange Forward        
Derivatives Fair Value [Line Items]        
Net forward contracts hedging portfolio   SFr 20,000,000 € 5,900,000 £ 4,800,000
Maximum        
Derivatives Fair Value [Line Items]        
Expiry dates ranging Jul. 06, 2017