Acquisitions and Divestitures of and Investments in Businesses and Technologies Acquisition-related Contingent Consideration (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Acquisition-related contingent consideration [Roll Forward]
Acquisition-related contingent consideration, Beginning Balance	$ 2,950	$ 1,567	$ 3,046	$ 1,741
Fair Value Contingent Consideration Acquisition of a Business	0	1,256	0	1,256
Change in fair value of acquisition-related contingent consideration	182	52	585	198
Contingent consideration earn-out paid	(721)	(44)	(1,220)	(364)
Acquisition-related contingent consideration, Ending Balance	2,411	2,831	2,411	2,831
Acquisition-related contingent consideration liability, current					$ 1,764	$ 815
Acquisition-related contingent consideration liability, Noncurrent					647	2,016
Business Combination, Contingent Consideration, Liability	$ 2,950	$ 1,567	$ 3,046	$ 1,741	2,411	$ 2,831
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			$ 1,232
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			$ 1,783
Engineered Films [Member] | CLI [Member]
Business Combination, Contingent Consideration Arrangements [Abstract]
Business Acquisition, 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			$ 667