Goodwill, Long-lived Assets and Other Intangibles Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Goodwill [Line Items]
Goodwill impairment loss	$ 0	$ 0
Goodwill [Roll Forward]
Goodwill Beginning balance	50,942
Goodwill, Measurement Period Adjustment	(33)
Goodwill, Foreign Currency Translation Gain (Loss)	(64)
Goodwill Ending balance	50,845
Applied Technology [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance	17,076
Goodwill, Measurement Period Adjustment	(33)
Goodwill, Foreign Currency Translation Gain (Loss)	(64)
Goodwill Ending balance	16,979
Engineered Films [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance	33,232
Goodwill, Measurement Period Adjustment	0
Goodwill, Foreign Currency Translation Gain (Loss)	0
Goodwill Ending balance	33,232
Aerostar [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance	634
Goodwill, Measurement Period Adjustment	0
Goodwill, Foreign Currency Translation Gain (Loss)	0
Goodwill Ending balance	$ 634