Revenue - Advertising Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jun. 25, 2017	Jul. 01, 2018	Jun. 25, 2017
Disaggregation of Revenue [Line Items]
Advertising revenue	$ 414,560	$ 407,074	$ 828,508	$ 805,878
Display
Disaggregation of Revenue [Line Items]
Advertising revenue	102,246	112,984	211,748	227,587
Classified and Other
Disaggregation of Revenue [Line Items]
Advertising revenue	16,955	19,250	33,100	34,675
Total advertising
Disaggregation of Revenue [Line Items]
Advertising revenue	119,201	132,234	244,848	262,262
Print | Display
Disaggregation of Revenue [Line Items]
Advertising revenue	60,803	68,499	131,608	140,126
Print | Classified and Other
Disaggregation of Revenue [Line Items]
Advertising revenue	7,367	8,557	15,506	17,287
Print | Total advertising
Disaggregation of Revenue [Line Items]
Advertising revenue	68,170	77,056	147,114	157,413
Digital | Display
Disaggregation of Revenue [Line Items]
Advertising revenue	41,443	44,485	80,140	87,461
Digital | Classified and Other
Disaggregation of Revenue [Line Items]
Advertising revenue	9,588	10,693	17,594	17,388
Digital | Total advertising
Disaggregation of Revenue [Line Items]
Advertising revenue	$ 51,031	$ 55,178	$ 97,734	$ 104,849