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Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Jun. 09, 2017
May 01, 2017
Apr. 11, 2017
Apr. 10, 2017
May 31, 2018
Apr. 16, 2018
May 31, 2016
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Equity (Textual)                    
Voting rights description               The holders of Class A common stock are entitled to three votes per share and the holders of Class B common stock are entitled to one-tenth of a vote per share.    
Class B common stock aggregate consideration                 $ 24,930  
Common Stock [Member]                    
Equity (Textual)                    
Total cash dividends paid               $ 13,900 $ 17,900 $ 17,400
Aggregate cash dividends paid per share               $ 0.56 $ 0.76 $ 0.75
Howard S. Jonas [Member]                    
Equity (Textual)                    
Aggregate purchase price         $ 1,500          
Class B Common Stock [Member]                    
Equity (Textual)                    
Repurchase of aggregate shares               8,000,000    
Class B common stock shares repurchased               367,484   398,376
Aggregate purchase price of shares repurchased               $ 1,900   $ 4,600
Shares remained available for repurchase under the stock repurchase program               7,600,000    
Class B Common Stock [Member] | August 1, 2018 through October 9, 2018 [Member]                    
Equity (Textual)                    
Class B common stock shares repurchased               729,110    
Aggregate purchase price of shares repurchased               $ 3,900    
Class B Common Stock [Member] | Employee [Member]                    
Equity (Textual)                    
Class B common stock shares repurchased               57,081 94,338 11,250
Aggregate purchase price of shares repurchased               $ 400 $ 1,800 $ 100
Class B Common Stock [Member] | Howard S. Jonas [Member]                    
Equity (Textual)                    
Treasury shares of common stock sold     728,332              
Closing price of Class B common stock   $ 14.93   $ 13.73            
Aggregate consideration for sale of treasury shares     $ 10,000              
Aggregate purchase price           $ 15,000        
Common stock shares purchased 1,000,000         2,546,689        
Aggregate consideration $ 14,900                  
Class B common stock at a price per share           $ 5.89        
Class B Common Stock [Member] | Zedge Spin-Off [Member]                    
Equity (Textual)                    
Percentage of capital stock             10.00%      
Proceeds from sale of interest in corporate unit total received             $ 3,000      
Amount paid by other purchasers             400      
Proceeds from sale of interest in corporate unit intercompany amount paid             $ 2,600