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Stock-Based Compensation Plans (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 28, 2020
Nov. 23, 2019
Nov. 28, 2020
Nov. 23, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 1,708 $ 1,643 $ 3,105 $ 3,158
Performance Incentive Plan 2020 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of common stock made available for awards 1,797,440   1,797,440  
Stock options vesting period     4 years  
Stock options termination period     10 years  
Shares available for grant 1,880,646   1,880,646  
Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of common stock made available for awards 1,825,000   1,825,000  
Shares available for grant 1,396,000   1,396,000  
Percentage of exercise price per share out of fair market value     85.00%  
Common stock issued     245,000 215,000
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to stock-based compensation $ 5,400   $ 5,400  
Weighted-average period of cost to be recognized     1 year 7 months 9 days  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to stock-based compensation 500   $ 500  
Weighted-average period of cost to be recognized     1 year 8 months 12 days  
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to stock-based compensation $ 6,600   $ 6,600  
Weighted-average period of cost to be recognized     2 years 4 months 17 days