Acquisition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Jan. 31, 2017
Business Acquisition [Line Items]
Business Acquisition, Date of Acquisition Agreement					Feb. 04, 2016
Business Acquisition, Name of Acquired Entity					PPC
Business Acquisition, Description of Acquired Entity					a coating and insulation company in Camrose, Alberta that serves the oil and gas industry in Western Canada
Cash to acquire businesses					$ 7,587
Business Combination, Consideration Transferred, Liabilities Incurred					2,000
Business Combination, Purchase consideration to third party					9,587
Business Combination, Step Acquisition,Fair value of 49% previously held equity interest					7,492
Business Combination, Consideration Transferred					17,079
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents					2,915
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment					13,124
Goodwill	$ 2,317		$ 2,317		2,279
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net working capital					406
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other assets (liabilities), net					(1,645)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net assets acquired					17,079
Business Acquisition, Transaction Costs					$ 200
Loss on consolidation of joint venture	$ 0	$ 0	$ 0	$ 1,620