Acquisitions and Divestitures of and Investments in Businesses and Technologies Acquisition-related Contingent Consideration (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Acquisition-related contingent consideration [Roll Forward]
Acquisition-related contingent consideration, Beginning Balance	$ 2,934	$ 4,172
Fair Value Contingent Consideration Acquisition of a Business	0	310
Change in fair value of acquisition-related contingent consideration	(55)	94
Contingent consideration earn-out paid	(101)	(620)
Acquisition-related contingent consideration, Ending Balance	2,778	3,956
Acquisition-related contingent consideration liability, current			$ 580	$ 1,306
Acquisition-related contingent consideration liability, Noncurrent			2,198	2,650
Business Combination, Contingent Consideration, Liability	$ 2,778	$ 3,956	2,778	$ 3,956
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] | Raven Europe [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	$ 2,338
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	$ 1,333