Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Percent	31.50%	27.20%	31.90%	30.70%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	$ 709		$ 709
CANADA
Income Tax Contingency [Line Items]
Undistributed Earnings of Foreign Subsidiaries	2,000		2,000
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries	$ 310		$ 310