Acquisitions and Divestitures of and Investments in Businesses and Technologies Acquisition-related Contingent Consideration (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Acquisition-related contingent consideration [Roll Forward]
Acquisition-related contingent consideration, Beginning Balance	$ 2,778	$ 3,956	$ 2,934	$ 4,172
Fair Value Contingent Consideration Acquisition of a Business	0	0	0	310
Change in fair value of acquisition-related contingent consideration	(157)	149	(212)	243
Contingent consideration earn-out paid	(162)	(526)	(263)	(1,146)
Acquisition-related contingent consideration, Ending Balance	2,459	3,579	2,459	3,579
Acquisition-related contingent consideration liability, current					$ 233	$ 1,013
Acquisition-related contingent consideration liability, Noncurrent					2,226	2,566
Business Combination, Contingent Consideration, Liability	$ 2,459	$ 3,579	$ 2,459	$ 3,579	2,459	$ 3,579
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			$ 2,500
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