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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 9 Months Ended
Jan. 01, 2019
Feb. 05, 2018
Oct. 31, 2019
Apr. 30, 2019
Apr. 30, 2018
Jul. 31, 2018
Oct. 31, 2019
Oct. 31, 2018
Business Combination, Description [Abstract]                
Business Combination, Consideration Transferred     $ 0       $ 0  
Variable Interest Entity Disclosure [Abstract]                
Proceeds from sale or maturity of investments             993 $ 7,334
Gain from sale of equity method investment             0 $ 5,785
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]                
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            
Applied Technology [Member] | AgSync [Member]                
Business Combination, Description [Abstract]                
Business Acquisition, Name of Acquired Entity AgSync Inc.              
Business Combination, Consideration Transferred $ 9,700              
Fair Value of Business Acquisition Contingent Consideration - at acquisition     2,052       2,052  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred       $ 300        
Goodwill     4,526       4,526  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     $ 5,700       $ 5,700  
Other Nonoperating Income (Expense) [Member] | Applied Technology [Member] | SST [Member]                
Variable Interest Entity Disclosure [Abstract]                
Gain from sale of equity method investment           $ 5,785