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Revenue from Contracts with Customers (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 28, 2024
Mar. 30, 2023
Dec. 28, 2023
Dec. 29, 2022
Revenue from Contract with Customer [Abstract]        
Noncancelable Long Term Contracts $ 0      
Unbilled accounts receivable 1,600,000 $ 3,500,000    
Contract with Customer, Liability, Change in Timeframe, Performance Obligation Satisfied, Revenue Recognized 6.7      
National advertising revenue        
Allowance for credit losses 100,000 300,000 $ 100,000 $ 300,000
Accounts Receivable, Credit Loss Expense (Reversal) 0 0    
Accounts Receivable, Allowance for Credit Loss, Writeoff 0 0    
Local And Regional Advertising Revenue [Member]        
Allowance for credit losses 1,200,000 1,400,000 $ 1,300,000 $ 1,400,000
Accounts Receivable, Credit Loss Expense (Reversal) (100,000) 0    
Accounts Receivable, Allowance for Credit Loss, Writeoff $ 0 $ 0