Goodwill, Long-lived Assets and Other Intangibles Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Goodwill [Line Items]
Goodwill impairment loss	$ 0	$ 0	$ 0	$ 0
Goodwill [Roll Forward]
Goodwill Beginning balance			107,677
Goodwill, Foreign Currency Translation Gain (Loss)			897
Goodwill Ending balance	108,574		108,574
Applied Technology (excluding Autonomy) [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance			73,811
Goodwill, Foreign Currency Translation Gain (Loss)			897
Goodwill Ending balance	74,708		74,708
Engineered Films [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance			33,232
Goodwill, Foreign Currency Translation Gain (Loss)			0
Goodwill Ending balance	33,232		33,232
Aerostar [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance			634
Goodwill, Foreign Currency Translation Gain (Loss)			0
Goodwill Ending balance	$ 634		$ 634