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Retirement Benefit Plans Deferred Compensation (Details) - USD ($)
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Schedule of Deferred Compensation      
Company's maximum match under employee deferred compensation program $ 4,500    
Deferred compensation arrangement with individual, employer contribution $ 500,000 $ 600,000 $ 500,000