Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Jan. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 4,728		$ 4,728		$ 4,444
Intangible assets, net	2,913		2,913		$ 3,128
Amortization of intangible assets	$ 100	$ 200	$ 300	$ 400
Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life			3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life			15 years