Income Taxes (Details) $ in Thousands	12 Months Ended
	Jan. 31, 2018 USD ($) percentagepoints	Jan. 31, 2017 USD ($)	Jan. 31, 2016 USD ($)
Income Tax Contingency [Line Items]
Statutory Federal tax rate - impact of TCJA | percentagepoints	1.2
Federal statutory rate - expected rate first year after TCJA effective	21.00%
Tax Cuts And Jobs Act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense	$ 265
Tax Cuts And Jobs Act of 2017, incomplete accounting, provisional income tax benefit	312
Tax benefit		$ 779	$ 560
Favorable prior year tax benefit		1,044	989
Impairment losses			14,756
Total unrecognized tax benefits that, if recognized, would affect the company's effective tax rate	2,143	1,806	2,140
Accrued interest and penalties related to unrecognized tax benefits	418	$ 500	$ 672
Tax expense for Foreign transition tax in the 2017 TCJA	265
United States
Income Tax Contingency [Line Items]
Pre-tax book income, domestic	58,757
Canada
Income Tax Contingency [Line Items]
Pre-tax book income, foreign	229
Undistributed earnings of foreign subsidiaries	$ 3,242