Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Income Tax Contingency [Line Items]
Total unrecognized tax benefits that, if recognized, would affect the company's effective tax rate	$ 1,617	$ 3,029	$ 2,738
Accrued interest and penalties related to unrecognized tax benefits	952	1,897	1,605
United States [Member]
Income Tax Contingency [Line Items]
Pre-tax book income, domestic	42,282
Canada [Member]
Income Tax Contingency [Line Items]
Pre-tax book income, foreign	(38)
Undistributed Earnings of Foreign Subsidiaries	1,490
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries	$ 231