Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Percent	31.40%	30.60%
Foreign Tax Authority [Member]
Income Tax Contingency [Line Items]
Undistributed Earnings of Foreign Subsidiaries	$ 2,836
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries	$ 346