Business Segments and Major Customer Information (Details) $ in Thousands	3 Months Ended								7 Months Ended		12 Months Ended
	Jan. 31, 2020 USD ($)	Oct. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)	Apr. 30, 2019 USD ($)	Jan. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Jul. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Aug. 31, 2018 USD ($)	Aug. 31, 2017 USD ($)	Jan. 31, 2020 USD ($) customer	Jan. 31, 2019 USD ($) customer	Jan. 31, 2018 USD ($) customer
Segment Reporting Information [Line Items]
Concentration risk, number of customers | customer											0	0	0
Net sales	$ 85,761	$ 100,533	$ 98,058	$ 98,178	$ 88,022	$ 104,833	$ 102,684	$ 111,129			$ 382,530	$ 406,668	$ 377,317
One Customer
Segment Reporting Information [Line Items]
Concentration risk percentage											10.00%	10.00%	10.00%
Engineered Films
Segment Reporting Information [Line Items]
Net sales											$ 197,719	$ 226,574	$ 213,298
Engineered Films | CLI
Segment Reporting Information [Line Items]
Net sales									$ 21,568	$ 4,109