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Stock-Based Compensation Plans (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Feb. 23, 2019
Feb. 24, 2018
Feb. 23, 2019
Feb. 24, 2018
May 26, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for grant 1,506,000   1,506,000    
Stock options vesting period     4 years    
Stock options exercise, intrinsic value $ 1,900,000 $ 900,000 $ 5,000,000 $ 1,300,000  
Unrecognized compensation cost related to stock-based compensation 9,300,000   $ 9,300,000    
Weighted-average period of cost to be recognized     36 months    
Stock-based compensation expense $ 1,900,000 $ 1,400,000 $ 4,961,000 4,499,000  
Capitalized share based compensation costs     $ 0 $ 0  
Restricted stock, shares granted 21,537 37,778 21,537 117,588  
Stock Incentive Plan 2014 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares of common stock made available for awards 2,400,000   2,400,000    
Stock options vesting period     4 years    
Stock options termination period     10 years    
Stock split conversion ratio     2.5    
Employee Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares of common stock made available for awards 5,900,000   5,900,000    
Shares available for grant 221,000   221,000    
Percentage of exercise price per share out of fair market value     85.00%    
Common stock issued     359,000   338,000
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation expense for restricted shares $ 83,000 $ 18,000 $ 157,000 $ 18,000  
Unvested restricted shares 77,789   77,789    
Total unrecognized compensation cost $ 1,200,000   $ 1,200,000    
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation expense for restricted shares $ 400,000 $ 400,000 $ 1,200,000 $ 1,000,000  
Unvested restricted shares 158,926   158,926    
Total unrecognized compensation cost $ 2,200,000   $ 2,200,000