Goodwill, Long-lived Assets and Other Intangibles Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Goodwill [Line Items]
Goodwill impairment loss	$ 0	$ 0	$ 0	$ 0
Goodwill [Roll Forward]
Goodwill Beginning balance			106,509
Goodwill, Measurement Period Adjustment			(440)
Goodwill, Foreign Currency Translation Gain (Loss)			(144)
Goodwill Ending balance	105,925		105,925
Applied Technology (excluding Autonomy) [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance			16,943
Goodwill, Measurement Period Adjustment			0
Goodwill, Foreign Currency Translation Gain (Loss)			145
Goodwill Ending balance	17,088		17,088
Autonomy [Member]
Goodwill [Roll Forward]
Goodwill Beginning balance			55,700
Goodwill, Measurement Period Adjustment			(440)
Goodwill, Foreign Currency Translation Gain (Loss)			(289)
Goodwill Ending balance	54,971		54,971
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		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		$ 634