Summary of Significant Accounting Policies (Details) $ in Thousands	9 Months Ended
	Oct. 31, 2015 ReportingUnits	Jul. 31, 2015 USD ($)
Engineered Films [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Excess in net book value | $		$ 50,700
Excess in net book value, percentage		37.20%
Aerostar [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of reporting units | ReportingUnits	2