Goodwil, Long-lived Assets, and Other Charges - Changes in the Carrying Amount of Goodwill by Reporting Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 106,509	$ 50,942
Goodwill, Acquired During Period		55,989
Goodwill, Purchase Accounting Adjustments	(440)
Goodwill, Foreign Currency Translation Gain (Loss)	1,608	(422)
Goodwill, end balance	107,677	106,509
Applied Technology
Goodwill [Roll Forward]
Goodwill, beginning balance	72,643	17,076
Goodwill, Acquired During Period		55,989
Goodwill, Purchase Accounting Adjustments	(440)
Goodwill, Foreign Currency Translation Gain (Loss)	1,608	(422)
Goodwill, end balance	73,811	72,643
Engineered Films
Goodwill [Roll Forward]
Goodwill, beginning balance	33,232	33,232
Goodwill, Acquired During Period		0
Goodwill, Purchase Accounting Adjustments	0
Goodwill, Foreign Currency Translation Gain (Loss)	0	0
Goodwill, end balance	33,232	33,232
Aerostar
Goodwill [Roll Forward]
Goodwill, beginning balance	634	634
Goodwill, Acquired During Period		0
Goodwill, Purchase Accounting Adjustments	0
Goodwill, Foreign Currency Translation Gain (Loss)	0	0
Goodwill, end balance	$ 634	$ 634