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Income taxes UTP (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Income Tax Contingency [Line Items]      
Balance at beginning of the year   $ 1,288 $ 1,358
Increases in positions taken in a prior period $ 11 17  
Increases in positions taken in a current period 14 0  
Decreases due to lapse of statute of limitations 0 (42)  
Decreases due to settlements 0 (45)  
Balance at the end of the year 1,313    
Unrecognized tax benefits, interest 28 17  
Unrecognized tax benefits, income tax penalties $ 17 $ 15