Goodwill, Long-lived Assets and Other Intangibles Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Goodwill [Line Items]
Goodwill impairment loss	$ 0	$ 0
Goodwill [Roll Forward]
Goodwill Beginning balance	106,509
Goodwill, Measurement Period Adjustment	55
Goodwill, Foreign Currency Translation Gain (Loss)	(1,956)
Goodwill Ending balance	104,608
Applied Technology (excluding Autonomy) [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance	16,943
Goodwill, Measurement Period Adjustment	0
Goodwill, Foreign Currency Translation Gain (Loss)	(36)
Goodwill Ending balance	16,907
Autonomy [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance	55,700
Goodwill, Measurement Period Adjustment	55
Goodwill, Foreign Currency Translation Gain (Loss)	(1,920)
Goodwill Ending balance	53,835
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