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Revenue from Contracts with Customers (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 26, 2019
Dec. 27, 2018
Dec. 28, 2017
Disaggregation of Revenue [Line Items]      
ContentSegmentSeconds 90 seconds    
Revenue $ 444.8 $ 441.4 $ 426.1
Make-good reserve $ 8.7 8.0  
Payment terms 30 days    
Unbilled contracts receivable $ 8.0 6.0  
Barter Transaction Revenue      
Disaggregation of Revenue [Line Items]      
Revenue 1.8 5.9 0.8
Costs of goods and services sold $ 2.1 $ 5.0 $ 1.4