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Valuation and Qualifying Accounts (Parenthetical) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Valuation And Qualifying Accounts [Abstract]      
Prior year adjustments $ 89 $ 177  
Reversal due to legal entity elimination (280)    
Expired tax losses   (745)  
Adjustments $ (191) $ (568) $ 29