Acquisitions of and Investments in Businesses and Technologies - Business Acquisition (Details) - USD ($) $ in Thousands		12 Months Ended
	Sep. 01, 2017	Jan. 31, 2018	Jan. 31, 2017	Oct. 31, 2016	Jan. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 46,710	$ 40,649		$ 40,672
Engineered Films
Business Acquisition [Line Items]
Goodwill		$ 33,232	27,518		27,518
Engineered Films | CLI
Business Acquisition [Line Items]
Business acquisition, effective date of acquisition		Sep. 01, 2017
Name of acquired entity		Colorado Lining International, Inc.
Adjustment to purchase price allocation	$ 566
Total purchase price from business acquisition	14,938
Fair value of contingent consideration	1,256
Goodwill	5,714
Amount of goodwill that is tax deductible	5,714
Engineered Films | Customer Relationships and Customer Contracts | CLI
Business Acquisition [Line Items]
Identifiable intangible assets acquired	$ 610
Applied Technology
Business Acquisition [Line Items]
Goodwill		$ 12,741	12,342		12,365
Applied Technology | SBG Innovatiie and affiliate
Business Acquisition [Line Items]
Date of acquisition agreement		May 01, 2014
Aerostar
Business Acquisition [Line Items]
Goodwill		$ 737	$ 789	$ 789	$ 789
Aerostar | Vista Research
Business Acquisition [Line Items]
Date of acquisition agreement		Jan. 06, 2012