Acquisitions of and Investments in Businesses and Technologies - Contingent Consideration (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2018	Jan. 31, 2017
Acquisition-related contingent consideration [Roll Forward]
Beginning balance	$ 1,741	$ 2,059
Fair value of contingent consideration acquired	1,256	0
Change in fair value of the liability	457	36
Contingent consideration earn-out paid	(408)	(354)	$ (814)
Ending balance	3,046	1,741	2,059
Balance Sheet Classification [Abstract]
Fair value of contingent consideration liability, current				$ 1,036	$ 345
Fair value of contingent consideration liability, noncurrent				2,010	1,396
Ending balance	$ 1,741	$ 2,059	$ 2,059	3,046	$ 1,741
Engineered Films | CLI
Balance Sheet Classification [Abstract]
Maximum amount of contingent consideration to be paid				2,000
Duration for payments of contingent consideration	3 years
Business acquisition contingent consideration cumulative paid	$ 0
Applied Technology | SBG Innovatiie and affiliate
Business Acquisition, Contingent Consideration [Line Items]
Date of acquisition agreement	May 01, 2014
Balance Sheet Classification [Abstract]
Maximum amount of contingent consideration to be paid				2,500
Duration for payments of contingent consideration	10 years
Business acquisition contingent consideration cumulative paid	$ 890
Aerostar | Vista Research
Business Acquisition, Contingent Consideration [Line Items]
Date of acquisition agreement	Jan. 06, 2012
Balance Sheet Classification [Abstract]
Maximum amount of contingent consideration to be paid				$ 15,000
Duration for payments of contingent consideration	7 years
Business acquisition contingent consideration cumulative paid	$ 1,572