Goodwill, Long-lived Assets and Other Intangibles Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Goodwill [Line Items]
Goodwill impairment loss	$ 0	$ 0
Goodwill [Roll Forward]
Goodwill Beginning balance	106,509
Goodwill, Measurement Period Adjustment	(440)
Goodwill, Foreign Currency Translation Gain (Loss)	(366)
Goodwill Ending balance	105,703
Applied Technology (excluding Autonomy) [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance	16,943
Goodwill, Measurement Period Adjustment	0
Goodwill, Foreign Currency Translation Gain (Loss)	184
Goodwill Ending balance	17,127
Autonomy [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance	55,700
Goodwill, Measurement Period Adjustment	(440)
Goodwill, Foreign Currency Translation Gain (Loss)	(550)
Goodwill Ending balance	54,710
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