Acquisitions of and Investments in Businesses and Technologies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014	Jan. 31, 2015
Business Combination, Description [Abstract]
Goodwill	$ 44,796	$ 25,234	$ 44,796	$ 25,234	$ 52,148
Business Combination, Contingent Consideration Arrangements [Abstract]
Acquisition-related contingent consideration liability, Current	492	1,191	492	1,191	1,375
Acquisition-related contingent consideration liability, Noncurrent	2,229	3,587	2,229	3,587	$ 3,631
Payments of acquisition-related contingent liability			$ (773)	(491)
Integra Plastics [Member]
Business Combination, Description [Abstract]
Business Acquisition, Name of Acquired Entity			Integra Plastics, Inc.
Business Combination Cash received for working capital adjustment			$ 351
Business Acquisition, adjustment to consideration transferred			20
Business Combination, Consideration Transferred			48,262
Goodwill	27,422		27,422
Business Acquisition, Goodwill, Expected Tax Deductible Amount	0		$ 0
SBG Innovatie [Member]
Business Combination, Description [Abstract]
Business Acquisition, Name of Acquired Entity			SBG Innovatie BV
Navtronics [Member]
Business Combination, Description [Abstract]
Business Acquisition, Name of Acquired Entity			Navtronics BVBA
SBG Innovatie and Affiliates [Member]
Business Combination, Description [Abstract]
Business Acquisition, Date of Acquisition Agreement			May 01, 2014
Contingent consideration, potential cash payment	2,500		$ 2,500
Contingent Consideration Term in Years			10 years
Business Combination, Contingent Consideration Arrangements [Abstract]
Acquisition-related contingent consideration, total liability	1,338	1,583	$ 1,338	1,583
Acquisition-related contingent consideration liability, Current	329	298	329	298
Acquisition-related contingent consideration liability, Noncurrent	1,009	1,285	1,009	1,285
Payments of acquisition-related contingent liability	38	37	$ 188	37
Vista Research [Member]
Business Combination, Description [Abstract]
Business Acquisition, Date of Acquisition Agreement			Jan. 06, 2012
Contingent consideration, potential cash payment	15,000		$ 15,000
Business acquisition contingent consideration payments period			7 years
Business Combination, Contingent Consideration Arrangements [Abstract]
Acquisition-related contingent consideration, total liability	1,340	2,841	$ 1,340	2,841
Acquisition-related contingent consideration liability, Current	120	539	120	539
Acquisition-related contingent consideration liability, Noncurrent	1,220	2,302	1,220	2,302
Payments of acquisition-related contingent liability	0	$ 0	585	$ 454
Cost of Sales [Member] | Vista Research [Member]
Business Combination, Contingent Consideration Arrangements [Abstract]
Reduction in fair value of contingent consideration liability			$ 1,483
Vista Research [Member] | Cost of Sales [Member]
Business Combination, Contingent Consideration Arrangements [Abstract]
Reduction in fair value of contingent consideration liability	$ 1,483