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Discontinued Operations (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 29, 2013
Dec. 31, 2017
Dec. 25, 2016
New England Media Group [Member]      
Discontinued operations      
Proceeds from the sale of discontinued operations $ 70.0    
Net after-tax proceeds from sale, including tax benefit $ 74.0    
Loss/(gain) on sales of disposal group   $ 0.7 $ 3.7
(Loss)/gain on sale, net of income taxes   $ (0.4) $ (2.3)
Metro Boston LLC [Member]      
Discontinued operations      
Equity method investment, ownership percentage 49.00%