Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Percent	30.70%	31.50%	30.70%	31.90%
Foreign Tax Authority [Member]
Income Tax Contingency [Line Items]
Undistributed Earnings of Foreign Subsidiaries	$ 3,053		$ 3,053
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries	$ 499		$ 499