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Shareholders' Equity (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2018
USD ($)
Apr. 27, 2019
USD ($)
shares
Apr. 28, 2018
shares
Apr. 27, 2019
USD ($)
shares
Apr. 28, 2018
USD ($)
shares
Jul. 31, 2018
USD ($)
Aug. 31, 2010
shares
Class A and Class B common stock [Abstract]              
Conversion of Class B common stock to Class A common stock (in shares) | shares       82,008      
Conversion of Class B common stock held in treasury stock to Class A common stock (in shares) | shares       64,801      
Cash Dividends [Abstract]              
Cash dividends paid | $       $ 1,700 $ 1,700    
Accumulated Other Comprehensive Loss [Abstract]              
Unrealized net foreign currency translation losses | $   $ (1,879)   (1,879)   $ (1,880)  
Unrealized net investment (losses) gains on available for sale investments | $   0   0   (5)  
Total accumulated other comprehensive loss | $   (1,879)   (1,879)   $ (1,885)  
Noncontrolling Interest [Member]              
Noncontrolling Interest Items [Abstract]              
Purchase of noncontrolling interest | $   $ 102   $ 103      
Noncontrolling Interest [Member] | Lowham [Member]              
Noncontrolling Interest Items [Abstract]              
Ownership percentage 100.00%         87.88%  
Noncontrolling Interest [Member] | Lowham [Member] | Maximum [Member]              
Noncontrolling Interest Items [Abstract]              
Purchase of noncontrolling interest | $ $ 100            
Class A Common Stock [Member]              
Class A and Class B common stock [Abstract]              
Percentage equity holders entitled to elect Board of Directors       25.00%      
Minimum percentage of the number of outstanding Class A shares to combined classes of shares       10.00%      
Voting power of Class A common share holders to the Class B common share holders       0.1      
Number of Class B shares to be converted into Class A shares (in shares) | shares       1      
Stock Repurchase Plan [Abstract]              
Number of shares authorized to be repurchased (in shares) | shares     122,918   122,918   200,000
Remaining number of shares authorized to be repurchased (in shares) | shares     77,082   77,082    
Number of share acquired (in shares) | shares   0 0 0 0