Acquisitions and Divestitures of and Investments in Businesses and Technologies Acquisition-related Contingent Consideration (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Acquisition-related contingent consideration [Roll Forward]
Acquisition-related contingent consideration, Beginning Balance	$ 3,046	$ 1,742
Change in fair value of acquisition-related contingent consideration	152	91
Payments of acquisition-related contingent liability	(295)	(161)
Acquisition-related contingent consideration, Ending Balance	2,903	1,672
Acquisition-related contingent consideration liability, current			$ 1,483	$ 434
Acquisition-related contingent consideration liability, Noncurrent			1,420	1,238
Business Combination, Contingent Consideration, Liability	$ 3,046	$ 1,742	2,903	$ 1,672
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	$ 974
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, 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