XML 81 R66.htm IDEA: XBRL DOCUMENT v3.8.0.1
Significant accounting policies Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Goodwill [Line Items]    
Goodwill description allocated between intangible assets and the net tangible assets of the acquired business with the residual of the purchase price recorded as goodwill  
Goodwill $ 2,423 $ 2,279
Foreign exchange change effect $ 144  
Date of annual goodwill impairment test impairment assessment of goodwill annually as of January 31  
No goodwill impairment There was no impairment to goodwill