Pension Benefits - Schedule of Multiemployer Plans (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2019 USD ($)	Sep. 29, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) Collective_Bargaining_Agreement	Dec. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jul. 01, 2018 USD ($)	Apr. 01, 2018 USD ($)	Dec. 29, 2019 USD ($)	Dec. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Pension Benefits
Multiemployer Plans, Gain (Loss) On Withdrawal Obligation	$ 0	$ 2,045	$ 0	$ 0	$ 0	$ 4,851	$ 0	$ 0	$ 2,045	$ 4,851	$ 4,320
Pension Plan
Pension Benefits
Multiemployer plan, withdrawal obligation	$ 82,000				$ 97,000				82,000	97,000
Multiemployer plan, period contributions									2,800	2,670	2,510
Pension Plan | CWAITU Negotiated Pension Plan
Pension Benefits
Multiemployer plan, period contributions									415	408	425
Pension Plan | Newspaper and Mail Deliverers'-Publishers' Pension Fund
Pension Benefits
Multiemployer plan, period contributions									1,014	992	995
Number of collective bargaining arrangements | Collective_Bargaining_Agreement				2
Pension Plan | GCIU-Employer Retirement Benefit Plan
Pension Benefits
Multiemployer plan, period contributions									$ 58	42	39
Collective bargaining agreement, actuarial calculation, period for smoothing investment losses (in years)									10 years
Pension Plan | Pressmen's Publishers' Pension Fund
Pension Benefits
Multiemployer plan, period contributions									$ 1,213	1,129	963
Collective bargaining agreement, actuarial calculation, period for smoothing investment losses (in years)									10 years
Pension Plan | Paper-Handlers' - Publishers' Pension Fund
Pension Benefits
Multiemployer plan, period contributions									$ 100	99	88
Collective bargaining agreement, actuarial calculation, period for smoothing investment losses (in years)									10 years
Pension Plan | Total of Individually Significant Multiemployer Plans
Pension Benefits
Multiemployer plan, period contributions									$ 2,800	$ 2,670	$ 2,510