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, 2020	Jan. 31, 2019
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 50,942	$ 46,710
Goodwill, Acquired During Period	55,989	4,559
Goodwill, Written off Related to Sale of Business Unit		(103)
Goodwill, Foreign Currency Translation Gain (Loss)	(422)	(224)
Goodwill, end balance	106,509	50,942
Applied Technology (excluding Autonomy)
Goodwill [Roll Forward]
Goodwill, beginning balance	17,076	12,741
Goodwill, Acquired During Period	(33)	4,559
Goodwill, Written off Related to Sale of Business Unit		0
Goodwill, Foreign Currency Translation Gain (Loss)	(100)	(224)
Goodwill, end balance	16,943	17,076
Autonomy
Goodwill [Roll Forward]
Goodwill, beginning balance	0	0
Goodwill, Acquired During Period	56,022	0
Goodwill, Written off Related to Sale of Business Unit		0
Goodwill, Foreign Currency Translation Gain (Loss)	(322)	0
Goodwill, end balance	55,700	0
Engineered Films
Goodwill [Roll Forward]
Goodwill, beginning balance	33,232	33,232
Goodwill, Acquired During Period	0	0
Goodwill, Written off Related to Sale of Business Unit		0
Goodwill, Foreign Currency Translation Gain (Loss)	0	0
Goodwill, end balance	33,232	33,232
Aerostar
Goodwill [Roll Forward]
Goodwill, beginning balance	634	737
Goodwill, Acquired During Period	0	0
Goodwill, Written off Related to Sale of Business Unit		(103)
Goodwill, Foreign Currency Translation Gain (Loss)	0	0
Goodwill, end balance	$ 634	$ 634