Acquisitions of and Investments in Businesses and Technologies Acquisition-related Contingent Consideration (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Acquisition-related contingent consideration [Roll Forward]
Acquisition-related contingent consideration, Beginning Balance	$ 1,567	$ 1,901	$ 1,741	$ 2,059
Fair Value Contingent Consideration Acquisition of a Business	1,256	0	1,256	0
Change in fair value of acquisition-related contingent consideration	52	(165)	198	(41)
Payments of acquisition-related contingent liability	(44)	(36)	(364)	(318)
Acquisition-related contingent consideration, Ending Balance	2,831	1,700	2,831	1,700
Acquisition-related contingent consideration liability, current					$ 815	$ 315
Acquisition-related contingent consideration liability, Noncurrent					2,016	1,385
Business Combination, Contingent Consideration, Liability	$ 1,567	$ 1,901	$ 1,741	$ 2,059	2,831	$ 1,700
Applied Technology [Member] | SBG Innovatiie and affiliate [Member]
Business Combination, Contingent Consideration Arrangements [Abstract]
Business Acquisition, Date of Acquisition Agreement			May 01, 2014
Contingent Consideration Term in Years			10 years
Contingent consideration, potential cash payment					2,500
Business acquisition contingent consideration cumulative paid			$ 847
Aerostar [Member] | Vista Research [Member]
Business Combination, Contingent Consideration Arrangements [Abstract]
Business Acquisition, Date of Acquisition Agreement			Jan. 06, 2012
Contingent Consideration Term in Years			7 years
Contingent consideration, potential cash payment					15,000
Business acquisition contingent consideration cumulative paid			$ 1,572
Engineered Films [Member] | CLI [Member]
Business Combination, Contingent Consideration Arrangements [Abstract]
Business Acquisition, Effective Date of Acquisition Agreement			Sep. 01, 2017
Contingent Consideration Term in Years			3 years
Contingent consideration, potential cash payment					$ 2,000
Business acquisition contingent consideration cumulative paid			$ 0