Acquisitions of and Investments in Businesses and Technologies (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014	Jan. 31, 2015
Business Combination, Description [Abstract]
Goodwill	$ 52,198,000	$ 25,420,000	$ 52,198,000	$ 25,420,000	$ 52,148,000
Business Combination, Contingent Consideration Arrangements [Abstract]
Acquisition-related contingent consideration liability, Current	1,028,000	919,000	1,028,000	919,000	1,375,000
Acquisition-related contingent consideration liability, Noncurrent	3,049,000	3,682,000	3,049,000	3,682,000	$ 3,631,000
Payments of acquisition-related contingent liability			$ (735,000)	(454,000)
Integra Plastics [Member]
Business Combination, Description [Abstract]
Business Acquisition, Name of Acquired Entity			Integra Plastics, Inc.
Business Combination Cash received for working capital adjustment			$ 351,000
Business Acquisition, adjustment to consideration transferred			20,000
Business Combination, Consideration Transferred			48,262,000
Goodwill	27,422,000		$ 27,422,000
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	2,500,000		$ 2,500,000
Contingent Consideration Term in Years			10 years
Business Combination, Contingent Consideration Arrangements [Abstract]
Acquisition-related contingent consideration, total liability	1,325,000	1,661,000	$ 1,325,000	1,661,000
Acquisition-related contingent consideration liability, Current	310,000	152,000	310,000	152,000
Acquisition-related contingent consideration liability, Noncurrent	1,015,000	1,509,000	1,015,000	1,509,000
Payments of acquisition-related contingent liability	121,000	0	$ 150,000	0
Vista Research [Member]
Business Combination, Description [Abstract]
Business Acquisition, Date of Acquisition Agreement			Jan. 06, 2012
Contingent consideration, potential cash payment	15,000,000		$ 15,000,000
Business acquisition contingent consideration payments period			7 years
Business Combination, Contingent Consideration Arrangements [Abstract]
Acquisition-related contingent consideration, total liability	2,720,000	2,745,000	$ 2,720,000	2,745,000
Acquisition-related contingent consideration liability, Current	686,000	569,000	686,000	569,000
Acquisition-related contingent consideration liability, Noncurrent	2,034,000	2,176,000	2,034,000	2,176,000
Payments of acquisition-related contingent liability	$ 0	$ 0	$ 585,000	$ 454,000