Goodwill, Other Intangible Assets And Intangible Liabilities - Narrative (Details) (USD $)	Mar. 29, 2015	Dec. 28, 2014	Dec. 27, 2013	Dec. 31, 2012
Schedule of Finite-Lived Intangible Liabilities [Line Items]
Net unfavorable broadcast rights contracts	$ 91,488,000	$ 102,582,000
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Amortization expense relating to amortizable intangible assets, excluding lease contract intangible assets, remainder of 2015	144,000,000
Amortization expense relating to amortizable intangible assets, excluding lease contract intangible assets, 2016	192,000,000
Amortization expense relating to amortizable intangible assets, excluding lease contract intangible assets, 2017	192,000,000
Amortization expense relating to amortizable intangible assets, excluding lease contract intangible assets, 2018	192,000,000
Amortization expense relating to amortizable intangible assets, excluding lease contract intangible assets, 2019	165,000,000
Amortization expense relating to amortizable intangible assets, excluding lease contract intangible assets, 2020	157,000,000
Net rent expense from amortization of lease contract intangible assets and liabilities, remainder of 2015	1,000,000
Net rent expense from amortization of lease contract intangible assets and liabilities, 2016	1,000,000
Net rent expense from amortization of lease contract intangible assets and liabilities, 2017	1,000,000
Net rent expense from amortization of lease contract intangible assets and liabilities, 2018	1,000,000
Net rent expense from amortization of lease contract intangible assets and liabilities, 2019	1,000,000
Net rent expense from amortization of lease contract intangible assets and liabilities, 2020	1,000,000
Amortization of broadcast rights contract intangible assets and liabilities, remainder of 2015	(14,000,000)
Amortization of broadcast rights contract intangible assets and liabilities, 2016	(15,000,000)
Amortization of broadcast rights contract intangible assets and liabilities, 2017	(2,000,000)
Amortization of broadcast rights contract intangible assets and liabilities, 2018	(2,000,000)
Amortization of broadcast rights contract intangible assets and liabilities, 2019	(2,000,000)
Amortization of broadcast rights contract intangible assets and liabilities, 2020	(2,000,000)
Local TV Acquisition
Schedule of Finite-Lived Intangible Liabilities [Line Items]
Intangible liabilities related to contracts for broadcast rights programming, Local TV Acquisition			9,000,000
Fresh-Start Adjustments
Schedule of Finite-Lived Intangible Liabilities [Line Items]
Unfavorable contract intangible liability				227,000,000
Broadcast Rights Intangible Liabilities
Schedule of Finite-Lived Intangible Liabilities [Line Items]
Net unfavorable broadcast rights contracts	91,279,000	102,373,000
Broadcast Rights Intangible Liabilities | Fresh-Start Adjustments
Schedule of Finite-Lived Intangible Liabilities [Line Items]
Net unfavorable broadcast rights contracts				$ 226,000,000