Revenue - Subscription, Advertising, and Other Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 509,103	$ 426,895	$ 1,480,645	$ 1,274,281
Product and service benchmark | Product concentration risk
Disaggregation of Revenue [Line Items]
As % of total	100.00%	100.00%	100.00%	100.00%
Subscription
Disaggregation of Revenue [Line Items]
Total revenues	$ 342,609	$ 300,950	$ 1,010,910	$ 879,573
Subscription | Product and service benchmark | Product concentration risk
Disaggregation of Revenue [Line Items]
As % of total	67.40%	70.50%	68.30%	69.00%
Advertising
Disaggregation of Revenue [Line Items]
Total revenues	$ 110,887	$ 79,253	$ 320,777	$ 253,150
Advertising | Product and service benchmark | Product concentration risk
Disaggregation of Revenue [Line Items]
As % of total	21.70%	18.60%	21.60%	19.90%
Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 55,607	$ 46,692	$ 148,958	$ 141,558
Other | Product and service benchmark | Product concentration risk
Disaggregation of Revenue [Line Items]
As % of total	10.90%	10.90%	10.10%	11.10%
Real Estate
Disaggregation of Revenue [Line Items]
Revenue not from contract with customer	$ 7,000	$ 7,000	$ 20,000	$ 22,000