Goodwill, Long-lived Assets and Other Intangibles Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Goodwill [Line Items]
Goodwill impairment loss	$ 0	$ 0
Goodwill [Roll Forward]
Goodwill Beginning balance	107,677
Goodwill, Foreign Currency Translation Gain (Loss)	1,607
Goodwill Ending balance	109,284
Applied Technology (excluding Autonomy) [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance	73,811
Goodwill, Foreign Currency Translation Gain (Loss)	1,607
Goodwill Ending balance	75,418
Engineered Films [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance	33,232
Goodwill, Foreign Currency Translation Gain (Loss)	0
Goodwill Ending balance	33,232
Aerostar [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance	634
Goodwill, Foreign Currency Translation Gain (Loss)	0
Goodwill Ending balance	$ 634