Revenue - Advertising Revenues (Details) - Advertising - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 392,420	$ 530,678	$ 558,253
Digital
Disaggregation of Revenue [Line Items]
Total revenues	228,594	260,454	258,873
Print
Disaggregation of Revenue [Line Items]
Total revenues	$ 163,826	$ 270,224	$ 299,380