Goodwill, Long-lived Assets and Other Intangibles Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Goodwill [Line Items]
Goodwill impairment loss	$ 0	$ 0
Long-lived asset impairment loss	0	$ 259
Goodwill [Roll Forward]
Goodwill Beginning balance	46,710
Goodwill, Written off Related to Sale of Business Unit	(103)
Goodwill, Foreign Currency Translation Gain (Loss)	(78)
Goodwill Ending balance	46,529
Applied Technology [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance	12,741
Goodwill, Written off Related to Sale of Business Unit	0
Goodwill, Foreign Currency Translation Gain (Loss)	(78)
Goodwill Ending balance	12,663
Engineered Films [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance	33,232
Goodwill, Written off Related to Sale of Business Unit	0
Goodwill, Foreign Currency Translation Gain (Loss)	0
Goodwill Ending balance	33,232
Aerostar [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance	737
Goodwill, Written off Related to Sale of Business Unit	(103)
Goodwill, Foreign Currency Translation Gain (Loss)	0
Goodwill Ending balance	$ 634