Long-lived assets and Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2017	Jan. 31, 2017
Property, Plant and Equipment [Line Items]
New Date of Annual Goodwill Impairment Test	impairment assessment of goodwill annually as of January 31
Impairment of long-lived assets	there was no impairment of long-lived assets as of October 31, 2017 or January 31, 2017
Goodwill recognized, 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	$ 2,317	$ 2,279
Goodwill, Period Increase (Decrease)	$ 38
Goodwill no impairment	There was no impairment to goodwill as of October 31, 2017.