Acquisitions of and Investments in Businesses and Technologies (Details) - USD ($)			12 Months Ended
	Nov. 03, 2014	May. 01, 2014	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Business Acquisition [Line Items]
Goodwill			$ 44,756,000	$ 52,148,000	$ 22,274,000	$ 22,274,000
Fair value of contingent consideration liability, current			407,000	1,375,000	890,000
Fair value of contingent consideration liability, non current			2,499,000	3,631,000	2,457,000
Cash paid to settle outstanding contingent consideration			$ (814,000)	(533,000)	(353,000)
Percentage of voting interest acquired			22.00%
Integra Plastics [Member]
Business Acquisition [Line Items]
Date of acquisition agreement	Nov. 03, 2014
Name of acquired entity	Integra Plastics, Inc.
Total purchase price from business acquisition	$ 48,200,000
Number of shares issued	1,541,696
Value of company's common stock	$ 39,252,000
Cash payments to acquire entity	9,361,000
Amount received in settlement of the working capital adjustment to the purchase price			$ (351,000)
Adjustment to purchase price allocation			20,000
Goodwill	27,422,000		27,422,000
Amount of goodwill that is tax deductible			0
Business acquisition-related debt, outstanding balance				0
Revenue of acquiree since acquisition date				5,627,000
Net loss since acquisition date				(874,000)
SBG Innovatiie and affiliate [Member]
Business Acquisition [Line Items]
Date of acquisition agreement		May 01, 2014
Total purchase price from business acquisition		$ 5,000,000
Goodwill		3,250,000
Amount of goodwill that is tax deductible		0
Amount of identifiable intangible assets acquired		2,104,000
Business acquisition-related debt, outstanding balance				0
Revenue of acquiree since acquisition date				3,245,000
Net loss since acquisition date				152,000
Maximum amount of contingent consideration to be paid		$ 2,500,000
Duration for payments of contingent consideration		10 years
Acquisition-related contingent liability, Total			1,499,000	1,432,000
Fair value of contingent consideration liability, current			249,000	236,000
Fair value of contingent consideration liability, non current			1,250,000	1,196,000
Business acquisition contingent consideration, cumulative amount paid			308,000
Cash paid to settle outstanding contingent consideration			$ 229,000	79,000
SBG Innovatie [Member]
Business Acquisition [Line Items]
Name of acquired entity		SBG Innovatie BV
Navtronics [Member]
Business Acquisition [Line Items]
Name of acquired entity		Navtronics BVBA
Vista Research [Member]
Business Acquisition [Line Items]
Date of acquisition agreement			Jan. 06, 2012
Maximum amount of contingent consideration to be paid			$ 15,000,000
Business acquisition contingent consideration payments period			7 years
Acquisition-related contingent liability, Total			$ 1,327,000	2,989,000	3,347,000
Fair value of contingent consideration liability, current			78,000	554,000	890,000
Fair value of contingent consideration liability, non current			1,249,000	2,435,000	2,457,000
Business acquisition contingent consideration, cumulative amount paid			1,392,000
Cash paid to settle outstanding contingent consideration			585,000	$ 454,000	$ 353,000
Vista Research [Member] | Cost of Sales [Member]
Business Acquisition [Line Items]
Reduction in fair value of contingent consideration liability			$ 1,483,000
Customer Relationships [Member] | Integra Plastics [Member]
Business Acquisition [Line Items]
Amount of identifiable intangible assets acquired	$ 10,000,000
Weighted average useful life	12 years
Customer Relationships [Member] | SBG Innovatie [Member]
Business Acquisition [Line Items]
Weighted average useful life		12 years
Other Intangible Assets [Member] | Integra Plastics [Member]
Business Acquisition [Line Items]
Amount of identifiable intangible assets acquired	$ 200,000
Weighted average useful life	2 years
Other Intangible Assets [Member] | SBG Innovatie [Member]
Business Acquisition [Line Items]
Weighted average useful life		5 years