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Stock-Based Compensation Plans (Narrative) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
May 30, 2020
USD ($)
$ / shares
shares
May 25, 2019
USD ($)
$ / shares
shares
May 26, 2018
USD ($)
$ / shares
shares
May 29, 2020
$ / shares
Oct. 15, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for grant 1,453,000 1,595,000      
Stock options vesting period 4 years        
Stock options exercise, intrinsic value | $ $ 1,200 $ 5,200 $ 1,700    
Stock options vested, total fair value | $ $ 3,500 $ 5,400 $ 5,100    
Weighted average estimated value per share of employee stock options granted | $ / shares $ 3.88 $ 4.74 $ 3.61    
Share price | $ / shares       $ 10.99  
Stock-based compensation expense | $ $ 6,057 $ 6,570 $ 6,033    
Granted 28,372        
Unvested restricted shares 89,907 158,926      
Stock Incentive Plan 2014 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options vesting period 4 years        
Stock options termination period 10 years        
Rate at which available shares are reduced 2.5        
Employee Stock Purchase Plan, 2014 [Member] | Stock Incentive Plan 2014 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for grant         6,000
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        
Shares available for grant 1,641,000        
Unrecognized compensation cost related to stock-based compensation | $ $ 7,600        
Weighted-average period of cost to be recognized 1 year 9 months 4 days        
Percentage of exercise price per share out of fair market value 85.00%        
Common stock issued 400,000 358,000 339,000    
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average period of cost to be recognized 1 year 8 months 12 days        
Total unrecognized compensation cost | $ $ 1,900        
Stock-based compensation expense | $ $ 1,100 $ 1,700 $ 1,400