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