Revenue Disaggregation of Revenues (Details) $ in Thousands	12 Months Ended
	Jan. 31, 2021 USD ($) ReportingUnits	Jan. 31, 2020 USD ($) ReportingUnits	Jan. 31, 2019 USD ($) ReportingUnits
Disaggregation of Revenue [Line Items]
Number of reportable segments | ReportingUnits	3	3	3
Net sales	$ 348,359	$ 382,530	$ 406,668
ELIM
Disaggregation of Revenue [Line Items]
Net sales	(103)	(92)	(522)
ATD
Disaggregation of Revenue [Line Items]
Net sales	147,198	130,460	129,749
EFD
Disaggregation of Revenue [Line Items]
Net sales	147,921	197,719	226,574
AERO
Disaggregation of Revenue [Line Items]
Net sales	53,343	54,443	50,867
All Segments
Disaggregation of Revenue [Line Items]
Net sales	348,359	382,530	406,668
Domestic
Disaggregation of Revenue [Line Items]
Net sales	302,645	340,398	358,339
Lighter-than-Air | Domestic
Disaggregation of Revenue [Line Items]
Net sales	36,966	36,535	37,866
Lighter-than-Air | Domestic | AERO
Disaggregation of Revenue [Line Items]
Net sales	36,966	36,535	37,866
Lighter-than-Air | International
Disaggregation of Revenue [Line Items]
Net sales	68	52	932
Lighter-than-Air | International | AERO
Disaggregation of Revenue [Line Items]
Net sales	68	52	932
Plastic Films & Sheeting | Domestic
Disaggregation of Revenue [Line Items]
Net sales	135,742	186,997	208,370
Plastic Films & Sheeting | Domestic | ELIM
Disaggregation of Revenue [Line Items]
Net sales	(100)	(90)	(512)
Plastic Films & Sheeting | Domestic | EFD
Disaggregation of Revenue [Line Items]
Net sales	135,842	187,087	208,882
Plastic Films & Sheeting | International
Disaggregation of Revenue [Line Items]
Net sales	12,079	10,632	17,692
Plastic Films & Sheeting | International | ELIM
Disaggregation of Revenue [Line Items]
Net sales	0	0	0
Plastic Films & Sheeting | International | EFD
Disaggregation of Revenue [Line Items]
Net sales	12,079	10,632	17,692
Precision Agriculture Equipment | Domestic
Disaggregation of Revenue [Line Items]
Net sales	113,637	99,135	100,041
Precision Agriculture Equipment | Domestic | ELIM
Disaggregation of Revenue [Line Items]
Net sales	(3)	(2)	(10)
Precision Agriculture Equipment | Domestic | ATD
Disaggregation of Revenue [Line Items]
Net sales	113,640	99,137	100,051
Precision Agriculture Equipment | International
Disaggregation of Revenue [Line Items]
Net sales	33,558	31,323	29,698
Precision Agriculture Equipment | International | ELIM
Disaggregation of Revenue [Line Items]
Net sales	0	0	0
Precision Agriculture Equipment | International | ATD
Disaggregation of Revenue [Line Items]
Net sales	33,558	31,323	29,698
Other | Domestic
Disaggregation of Revenue [Line Items]
Net sales	16,300	17,731	12,062
Other | Domestic | AERO
Disaggregation of Revenue [Line Items]
Net sales	16,300	17,731	12,062
Other | International
Disaggregation of Revenue [Line Items]
Net sales	9	125	7
Other | International | AERO
Disaggregation of Revenue [Line Items]
Net sales	$ 9	$ 125	$ 7