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Acquisitions and Divestitures of and Investments in Businesses and Technologies Business Combinations (Details) - USD ($)
$ in Thousands
3 Months Ended
Feb. 05, 2018
Sep. 01, 2017
Apr. 30, 2018
Apr. 30, 2017
Jan. 31, 2018
Variable Interest Entity Disclosure [Abstract]          
Proceeds from sale or maturity of investments     $ 6,556 $ 0  
Equity Method Investment, Realized Gain (Loss) on Disposal     $ 5,785 $ 0  
Engineered Films [Member] | CLI [Member]          
Business Combination, Description [Abstract]          
Business Acquisition, Effective Date of Acquisition Agreement     Sep. 01, 2017    
Business Acquisition, Name of Acquired Entity     Colorado Lining International, Inc.    
Business Combination, Consideration Transferred   $ 14,938      
Fair Value of Business Acquisition Contingent Consideration - at acquisition   1,256      
Goodwill   5,714      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   $ 610      
Aerostar [Member]          
Business Combination, Description [Abstract]          
Proceeds from disposal of Aerostar client private business     $ 832    
Applied Technology [Member] | SST [Member]          
Variable Interest Entity Disclosure [Abstract]          
Disposal Date Feb. 05, 2018        
Equity Method Investment, Ownership Percentage         22.00%
Equity Method Investment, Additional Information SST        
Equity Method Investments         $ 1,937
Proceeds from sale or maturity of investments $ 6,556        
Other Nonoperating Income (Expense) [Member] | Applied Technology [Member] | SST [Member]          
Variable Interest Entity Disclosure [Abstract]          
Equity Method Investment, Realized Gain (Loss) on Disposal     $ (5,785)