Investments Career Builder and CV (Details) - USD ($) $ in Thousands					1 Months Ended	3 Months Ended			9 Months Ended
		Apr. 02, 2015	Oct. 01, 2014	Apr. 01, 2014	Oct. 31, 2015	Sep. 30, 2015	Dec. 28, 2014	Sep. 28, 2014	Sep. 30, 2015	Sep. 28, 2014	Oct. 30, 2015
Schedule of Equity Method Investments [Line Items]
Equity method investments						$ 1,645,979	$ 1,689,996		$ 1,645,979
Income on equity investments, net						36,987		$ 40,559	119,834	$ 197,775
Distributions from equity investments									156,395	173,420
Operating revenues								144,890		970,501
Equity Method Investment, Amortization Of Basis Difference	[1]					$ 13,562		14,374	$ 40,686	128,774
CareerBuilder, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage						32.10%			32.10%
Equity method investments						$ 338,000	328,000		$ 338,000
Income on equity investments, net						11,000		13,000	28,000	28,000
Distributions from equity investments						16,000			16,000
Operating revenues								3,000		24,000
Revenues, net						175,540		184,647	526,728	532,796
Operating income from continuing operations						37,353		46,362	101,293	102,176
Net income						$ 36,470		44,837	$ 97,884	100,093
Apartments.com
Schedule of Equity Method Investments [Line Items]
Income on equity investments, net										72,000
Proceeds from Sale of Equity Method Investments										160,000
Equity Method Investment, Amortization Of Basis Difference										(85,000)
Apartments.com | Classified Ventures LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from Sale of Equity Method Investments				$ 585,000
Classified Ventures LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			27.80%
Distributions from equity investments			$ 6,000
Operating revenues								$ 6,000		$ 44,000
Proceeds from Sale of Equity Method Investments		$ 8,000	686,000
Equity method investment, value at time of transaction			2,500,000
Equity Method Investment, Net Sales Proceeds Received By Selling Partners			1,800,000
Equity Method Investment, Net Sales Proceeds			426,000
Equity Method Investment, Net Sales Proceeds Held In Escrow			$ 28,000
Equity Method Investment, Realized Gain (Loss) on Disposal							$ 372,000
Classified Ventures LLC | Subsequent Event
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Net Sales Proceeds Held in Escrow Received					$ 25,000
Equity Method Investment, Net Sales Proceeds Held In Escrow In Dispute											$ 3,000

[1] Amortization of basis difference for the nine months ended September 28, 2014 includes $85 million related to the sale by CV of its Apartments.com business.