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Stock-Based Compensation Plans (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Nov. 24, 2018
Nov. 25, 2017
Nov. 24, 2018
Nov. 25, 2017
May 26, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for grant 1,359,000   1,359,000    
Stock options vesting period     4 years    
Stock options exercise, intrinsic value $ 2,300,000 $ 400,000 $ 3,100,000 $ 500,000  
Unrecognized compensation cost related to stock-based compensation 10,500,000   $ 10,500,000    
Weighted-average period of cost to be recognized     38 months    
Stock-based compensation expense $ 1,700,000 1,500,000 $ 3,013,000 3,062,000  
Capitalized share based compensation costs     $ 0 $ 0  
Restricted stock, shares granted     0 79,810  
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 414,000   414,000    
Percentage of exercise price per share out of fair market value     85.00%    
Common stock issued     166,000   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 $ 41,000   $ 75,000    
Unvested restricted shares 34,715   34,715    
Total unrecognized compensation cost $ 400,000   $ 400,000    
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation expense for restricted shares $ 400,000 $ 300,000 $ 800,000 $ 600,000  
Unvested restricted shares 202,775   202,775    
Total unrecognized compensation cost $ 2,300,000   $ 2,300,000