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, 2018	Jan. 31, 2017
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 40,649	$ 40,672
Goodwill, Acquired During Period		5,714
Goodwill, Written off Related to Sale of Business Unit		(52)
Goodwill, Foreign Currency Translation Gain (Loss)		399	(23)
Goodwill, Transfers			0
Goodwill, end balance		46,710	40,649
Applied Technology
Goodwill [Roll Forward]
Goodwill, beginning balance		12,342	12,365
Goodwill, Acquired During Period		0
Goodwill, Written off Related to Sale of Business Unit		0
Goodwill, Foreign Currency Translation Gain (Loss)		399	(23)
Goodwill, Transfers			0
Goodwill, end balance		12,741	12,342
Engineered Films
Goodwill [Roll Forward]
Goodwill, beginning balance		27,518	27,518
Goodwill, Acquired During Period		5,714
Goodwill, Written off Related to Sale of Business Unit		0
Goodwill, Foreign Currency Translation Gain (Loss)		0	0
Goodwill, Transfers			0
Goodwill, end balance		33,232	27,518
Aerostar
Goodwill [Roll Forward]
Goodwill, beginning balance		789	789
Goodwill, Acquired During Period		0
Goodwill, Written off Related to Sale of Business Unit		(52)
Goodwill, Foreign Currency Translation Gain (Loss)		0	0
Goodwill, Transfers	[1]		0
Goodwill, end balance		$ 737	$ 789

[1] The Company combined the Aerostar and Vista reporting units in fiscal 2017. No goodwill amount was transferred between reporting units due to the goodwill impairment loss recorded at the Vista reporting unit during fiscal 2016.