Acquisitions and Divestitures of and Investments in Businesses and Technologies Acquisition-related Contingent Consideration (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Acquisition-related contingent consideration [Roll Forward]
Acquisition-related contingent consideration, Beginning Balance	$ 4,172	$ 3,046
Fair Value Contingent Consideration Acquisition of a Business	310	0
Change in fair value of acquisition-related contingent consideration	94	152
Contingent consideration earn-out paid	(620)	(295)
Acquisition-related contingent consideration, Ending Balance	3,956	2,903
Acquisition-related contingent consideration liability, current			$ 1,306	$ 1,483
Acquisition-related contingent consideration liability, Noncurrent			2,650	1,420
Business Combination, Contingent Consideration, Liability	$ 4,172	$ 3,046	3,956	$ 2,903
Applied Technology [Member] | AgSync [Member]
Business Combination, Contingent Consideration Arrangements [Abstract]
Contingent Consideration Term in Years	3 years
Contingent consideration, potential cash payment			3,500
Business acquisition contingent consideration cumulative paid	$ 0
Applied Technology [Member] | SBG Innovatiie and affiliate [Member]
Business Combination, Contingent Consideration Arrangements [Abstract]
Contingent Consideration Term in Years	10 years
Contingent consideration, potential cash payment			2,500
Business acquisition contingent consideration cumulative paid	$ 1,564
Aerostar [Member] | ATS [Member]
Business Combination, Contingent Consideration Arrangements [Abstract]
Contingent Consideration Term in Years	7 years
Contingent obligation remaining			0
Engineered Films [Member] | CLI [Member]
Business Combination, Contingent Consideration Arrangements [Abstract]
Contingent Consideration Term in Years	3 years
Contingent consideration, potential cash payment			$ 2,000
Business acquisition contingent consideration cumulative paid	$ 667