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Acquisitions and Divestitures of and Investments in Businesses and Technologies Business Combinations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 05, 2018
Sep. 01, 2017
Jul. 31, 2018
Jul. 31, 2018
Jul. 31, 2017
Jan. 31, 2018
Variable Interest Entity Disclosure [Abstract]            
Proceeds from sale or maturity of investments       $ 6,668 $ 250  
Gain from sale of equity method investment       (5,785) $ 0  
Engineered Films [Member] | CLI [Member]            
Business Combination, Description [Abstract]            
Business Acquisition, Effective Date of Acquisition   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     $ 0 832    
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal     0      
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]            
Gain from sale of equity method investment     $ 0 $ 5,785