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Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Jul. 31, 2016
Jan. 31, 2016
Jul. 31, 2015
Designated as Hedging Instrument      
Fair value and presentation of derivatives      
Asset Derivatives $ 194 $ 63 $ 70
Liability Derivatives     56
Designated as Hedging Instrument | Foreign Exchange Contract | Other Current Assets      
Fair value and presentation of derivatives      
Asset Derivatives 194 63 70
Designated as Hedging Instrument | Foreign Exchange Contract | Accrued Liabilities      
Fair value and presentation of derivatives      
Liability Derivatives     56
Not Designated as Hedging Instrument      
Fair value and presentation of derivatives      
Asset Derivatives 355 1 33
Liability Derivatives 92 1,163 589
Not Designated as Hedging Instrument | Foreign Exchange Contract | Other Current Assets      
Fair value and presentation of derivatives      
Asset Derivatives 355 1 33
Not Designated as Hedging Instrument | Foreign Exchange Contract | Accrued Liabilities      
Fair value and presentation of derivatives      
Liability Derivatives $ 92 $ 1,163 $ 589