Summary of Significant Accounting Policies Goodwill Fair Value Analysis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014	Jul. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill impairment loss	$ 7,413	$ 0	$ 7,413	$ 0
Engineered Films [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Reporting Unit, Amount of Fair Value in Excess (short fall) of Carrying Amount					$ 50,700
Reporting Unit, Percentage of Fair Value in Excess (Short fall) of Carrying Amount					37.20%
Goodwill impairment loss	0	0	0	0
Vista Reporting Unit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Reporting Unit, Amount of Fair Value in Excess (short fall) of Carrying Amount	$ (8,357)		$ (8,357)
Reporting Unit, Percentage of Fair Value in Excess (Short fall) of Carrying Amount	(35.00%)		(35.00%)
Goodwill impairment loss	$ 7,413	$ 0	$ 7,413	$ 0