Business Segments and Major Customer Information (Details)	12 Months Ended
	Jan. 31, 2015 customer	Jan. 31, 2014 customer	Jan. 31, 2013 customer
Segment Reporting Information [Line Items]
Number of Raven Divisions	2
One Customer [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	10.00%
Engineered Films [Member] | One Customer [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	14.00%	13.00%	11.00%
Receivables from major customer, percentage	5.00%	2.00%	3.00%
Concentration risk, number of customers	1	1	1