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Employee Benefit Plans (Details)
$ in Thousands
12 Months Ended
Dec. 30, 2018
USD ($)
plan
Dec. 31, 2017
USD ($)
Dec. 25, 2016
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Maximum annual contributions per employee, percent 100.00%    
Company's matching contributions | $ $ 3,988 $ 3,365 $ 2,959
Number of deferred compensation plans | plan 2    
Publishers' Deferred Compensation [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Vesting period in years 15 years    
Percent of accrued benefits that have vested 100.00%    
Executive Benefit Deferred Compensation Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Vesting period in years 5 years    
Executive Deferral Deferred Compensation Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Percent of accrued benefits that have vested 100.00%