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Investment Income, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Net Investment Income      
Distributions, including dividends $ 0 $ 0 $ 54,911
Gain on sale of investments, net 2,570 497 335
Other than temporary loss on cost method investment (258) 0 (3,150)
Other, net 391 226 118
Investment income, net $ 2,703 $ 723 52,214
Arby's Restaurant Group, Inc | Investment Income      
Net Investment Income      
Distributions, including dividends     $ 54,911