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Income taxes UTP (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Income Tax Contingency [Line Items]      
Balance at beginning of the year   $ 1,313 $ 1,288
Increases in positions taken in a prior period $ 3 11  
Increases in positions taken in a current period 19 14  
Decreases due to lapse of statute of limitations (4) 0  
Balance at the end of the year 1,331    
Unrecognized tax benefits, interest 30 28  
Unrecognized tax benefits, income tax penalties $ 16 $ 17