Restructuring Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ 399
Payments for Restructuring	$ 55	344
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs		250
Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs		149
Applied Technology [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	588	308
Receivable from sale of business	255
Applied Technology [Member] | Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	407
Applied Technology [Member] | Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	181
Engineered Films [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ 91
Vista Research [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	73
Amount of unpaid costs	0
Vista Research [Member] | Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	58
Vista Research [Member] | Research and Development Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 15