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Statement of Shareholders' Equity Statement of Shareholders' Equity (Parenthetical) - USD ($)
3 Months Ended
Mar. 31, 2019
Dec. 30, 2018
Sep. 23, 2018
Mar. 25, 2018
Dec. 24, 2017
Sep. 24, 2017
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax $ 0     $ 0    
AOCI Attributable to Parent [Member]            
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax 0 $ 0 $ 0 0 $ 0 $ 0
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax $ 0 $ 0 $ 0 $ 0 $ 0 $ 0