Revenue - Subscription, Advertising, and Other Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 498,497	$ 403,750	$ 971,542	$ 847,386
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	$ 339,217	$ 293,189	$ 668,301	$ 578,623
Subscription | Product and service benchmark | Product concentration risk
Disaggregation of Revenue [Line Items]
As % of total	68.10%	72.60%	68.80%	68.30%
Advertising
Disaggregation of Revenue [Line Items]
Total revenues	$ 112,774	$ 67,760	$ 209,890	$ 173,897
Advertising | Product and service benchmark | Product concentration risk
Disaggregation of Revenue [Line Items]
As % of total	22.60%	16.80%	21.60%	20.50%
Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 46,506	$ 42,801	$ 93,351	$ 94,866
Other | Product and service benchmark | Product concentration risk
Disaggregation of Revenue [Line Items]
As % of total	9.30%	10.60%	9.60%	11.20%
Real Estate
Disaggregation of Revenue [Line Items]
Revenue not from contract with customer	$ 7,000	$ 7,000	$ 13,000	$ 15,000