Acquisitions Narrative (Details) $ in Thousands, set_up_box in Millions, professional in Millions							1 Months Ended	3 Months Ended	6 Months Ended
	May. 31, 2015 USD ($)	Oct. 01, 2014 USD ($) television_channel	Aug. 29, 2014 USD ($) project professional	Jul. 04, 2014 USD ($) set_up_box country television_channel	May. 01, 2014 USD ($)	Jan. 31, 2014 USD ($)	May. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 29, 2014 USD ($)	Dec. 28, 2014 USD ($)
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired									$ 69,974	$ 191,596
Goodwill								$ 3,946,481	3,946,481		$ 3,918,136
Infostrada, SportsDirect, Covers, Enswers
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life							12 years
Payments to Acquire Businesses, Gross	$ 71,784
Cash Acquired from Acquisition	(1,919)
Payments to acquire businesses, net of cash acquired	69,865						$ 69,865
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Restricted Cash	404						404
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	2,481						2,481
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	805						805
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent	3,816						3,816
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	157						157
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities	(1,507)						(1,507)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue	(339)						(339)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent	(10,097)						(10,097)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities	(477)						(477)
Net assets acquired	39,343						39,343
Goodwill	30,522						30,522
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	69,865						$ 69,865
Business Combination, Acquisition Related Costs									$ 2,000
HWW
Business Acquisition [Line Items]
Number of national and local TV channels | television_channel		500
Liabilities acquired		$ 2,000
Payments to acquire businesses, net of cash acquired		18,000
Intangible assets acquired		9,000
Goodwill		$ 12,000
Baseline, LLC
Business Acquisition [Line Items]
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
Payments to acquire businesses, net of cash acquired			$ 49,000
Intangible assets acquired			26,000
Net assets acquired			300
Goodwill			$ 23,000
What's On
Business Acquisition [Line Items]
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
Payments to acquire businesses, net of cash acquired				$ 21,000
Intangible assets acquired				14,000
Goodwill				$ 16,000
Gracenote, Inc.
Business Acquisition [Line Items]
Liabilities acquired						$ 21,000
Payments to acquire businesses, net of cash acquired						158,000
Intangible assets acquired						113,000
Goodwill						$ 66,000
Landmark Acquisition Distributed in Spin-off
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired					$ 29,000
OtherAcquisition
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired										$ 2,000
Customer Relationships | Infostrada, SportsDirect, Covers, Enswers
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life							11 years
Intangible assets acquired	17,000						$ 17,000
Media Content | Infostrada, SportsDirect, Covers, Enswers
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life							14 years
Intangible assets acquired	13,900						$ 13,900
Technology-Based Intangible Assets | Infostrada, SportsDirect, Covers, Enswers
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life							8 years
Intangible assets acquired	6,900						$ 6,900
Trademarks and Trade Names | Infostrada, SportsDirect, Covers, Enswers
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life							15 years
Intangible assets acquired	5,200						$ 5,200
Noncompete Agreements | Infostrada, SportsDirect, Covers, Enswers
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life							5 years
Intangible assets acquired	$ 1,100						$ 1,100