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Income Taxes (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Feb. 23, 2019
Feb. 24, 2018
Feb. 23, 2019
Feb. 24, 2018
Dec. 31, 2018
May 26, 2018
Dec. 31, 2017
Income Taxes [Abstract]              
Statutory tax rate         21.00%   35.00%
Remeasurement of deferred tax assets and liabilities, income tax benefit $ 0         $ 800,000  
Provision for income taxes $ 3,822,000 $ 46,000 $ 12,457,000 $ 5,117,000      
Effective tax rate 40.00% 1.00% 36.00% 26.00%      
Reversal of liability for uncertain tax position   $ 2,200,000          
Tax benefit related to stock-based compensation $ 200,000 $ 200,000 $ 200,000 $ 800,000