Long-lived assets and Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Jan. 31, 2018
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 April 30, 2018 or January 31, 2018
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	$ 2,321	$ 2,423
Goodwill, Period Increase (Decrease)	$ (102)
Goodwill no impairment	There was no impairment to goodwill as of April 30, 2018 or January 31, 2018.