Acquisitions Narrative (Details) $ in Thousands, set_up_box in Millions, professional in Millions						1 Months Ended	3 Months Ended	9 Months Ended
	Oct. 01, 2014 USD ($) television_channel	Aug. 29, 2014 USD ($) project professional	Jul. 04, 2014 USD ($) television_channel set_up_box country	May. 01, 2014 USD ($)	Jan. 31, 2014 USD ($)	May. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Sep. 28, 2014 USD ($)	Dec. 28, 2014 USD ($)
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired								$ 75,000	$ 261,584
Goodwill								3,945,265		$ 3,918,136
Infostrada, SportsDirect, Covers, Enswers
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired						$ 69,891
Transaction costs								$ 2,000
Intangible assets, useful life (years)						12 years
Total identifiable net assets						$ 39,343
Goodwill						$ 30,548
HWW
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired	$ 18,000
Goodwill	$ 12,000
Number of national and local TV channels | television_channel	500
Intangible assets subject to amortization	$ 9,000
Liabilities acquired	$ 2,000
Baseline, LLC
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired		$ 49,000
Total identifiable net assets		300
Goodwill		23,000
Intangible assets subject to amortization		$ 26,000
Number of movie and TV projects | project		300,000
Number of TV and film professionals | professional		1.5
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
Goodwill			16,000
Intangible assets subject to amortization			14,000
Liabilities acquired			3,000
Consideration transferred			27,000
Consideration transferred, liabilities incurred			6,000
Consideration transferred, potential additional payment			$ 8,000
Consideration transferred, additional payment made							$ 4,000
Number of Countries with electronic program guide data and TV search products | country			16
Number of television channels | television_channel			1,600
Number of set-up boxes | set_up_box			58
Gracenote, Inc.
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired					$ 158,000
Goodwill					66,000
Intangible assets subject to amortization					113,000
Liabilities acquired					$ 21,000
OtherAcquisition
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired									$ 2,000
Landmark Acquisition Distributed in Spin-off
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired				$ 29,000
Customer Relationships | Infostrada, SportsDirect, Covers, Enswers
Business Acquisition [Line Items]
Intangible assets, useful life (years)						11 years
Intangible assets subject to amortization						$ 17,000
Content Databases | Infostrada, SportsDirect, Covers, Enswers
Business Acquisition [Line Items]
Intangible assets, useful life (years)						14 years
Intangible assets subject to amortization						$ 13,900
Technologies | Infostrada, SportsDirect, Covers, Enswers
Business Acquisition [Line Items]
Intangible assets, useful life (years)						8 years
Intangible assets subject to amortization						$ 6,900
Trade Name and Trademarks | Infostrada, SportsDirect, Covers, Enswers
Business Acquisition [Line Items]
Intangible assets, useful life (years)						15 years
Intangible assets subject to amortization						$ 5,200
Non-competition Agreements | Infostrada, SportsDirect, Covers, Enswers
Business Acquisition [Line Items]
Intangible assets, useful life (years)						5 years
Intangible assets subject to amortization						$ 1,100