Acquisitions Narrative (Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 29, 2015	Mar. 30, 2014	Oct. 01, 2014 television_channel	Aug. 29, 2014 project professional	Jul. 04, 2014 country television_channel set_up_box	Jan. 31, 2014	May 01, 2014	Dec. 28, 2014
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired	$ 109,000	$ 158,814,000
Goodwill	3,916,266,000							3,918,136,000
HWW
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired			18,000,000
Number of national and local TV channels			500
Intangible assets acquired			9,000,000
Liabilities acquired			2,000,000
Goodwill			12,000,000
Baseline, LLC
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired				49,000,000
Intangible assets acquired				26,000,000
Goodwill				23,000,000
Net assets acquired				300,000
Number of movie and TV projects				300,000
Number of TV and film professionals				1,500,000
Tax deductible period-intangible assets and goodwill acquired				15 years
What's On
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired					21,000,000
Intangible assets acquired					14,000,000
Liabilities acquired					3,000,000
Goodwill					16,000,000
Consideration transferred					27,000,000
Consideration transferred, liabilities incurred					6,000,000
Consideration transferred, potential additional payment					8,000,000
Number of Countries with electronic program guide data and TV search products					16
Number of television channels					1,600
Number of set-up boxes					58,000,000
Gracenote, Inc.
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired						158,000,000
Intangible assets acquired						113,000,000
Liabilities acquired						21,000,000
Goodwill						66,000,000
Landmark Acquisition Distributed in Spin-off
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired							$ 29,000,000