Pension Benefits - Changes in Benefit Obligation and Plan Assets (Details) (USD $)	12 Months Ended
	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010
Defined Benefit Plan, Change in Fair Value of Plan Assets
Accumulated benefit obligation	$ 2,310,000,000	$ 2,220,000,000
Qualified Plans [Member]
Change in benefit obligation
Benefit obligation at beginning of year	1,986,502,000	1,823,625,000
Service cost	11,903,000	12,079,000	12,045,000
Interest cost	96,265,000	99,991,000	102,523,000
Plan participants’ contributions	32,000	34,000
Amendments	(31,839,000)	0
Actuarial loss	164,383,000	140,186,000
Lump-sum settlement paid	(112,404,000)	0
Effect of sale of Regional Media Group	(13,510,000)	0
Benefits paid	(89,340,000)	(89,413,000)
Effects of change in currency conversion	0	0
Benefit obligation at end of year	2,011,992,000	1,986,502,000	1,823,625,000
Defined Benefit Plan, Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year	1,464,729,000	1,381,811,000
Actual return on plan assets	217,371,000	21,712,000
Employer contributions	143,748,000	150,585,000
Lump-sum settlement paid	(112,404,000)	0
Effect of sale of Regional Media Group	(8,413,000)	0
Fair value of plan assets at end of year	1,615,723,000	1,464,729,000	1,381,811,000
Net amount recognized	(396,269,000)	(521,773,000)
Current liabilities	0	0
Noncurrent liabilities	(396,269,000)	(521,773,000)
Actuarial loss	886,754,000	904,214,000
Prior service (credit)/cost	(30,454,000)	1,959,000
Total amount recognized in accumulated other comprehensive loss	856,300,000	906,173,000
Non-Qualified Plans [Member]
Change in benefit obligation
Benefit obligation at beginning of year	277,060,000	253,743,000
Service cost	1,656,000	1,660,000	1,896,000
Interest cost	12,807,000	13,293,000	13,602,000
Plan participants’ contributions	0	0
Amendments	0	0
Actuarial loss	32,906,000	25,621,000
Lump-sum settlement paid	0	0
Effect of sale of Regional Media Group	0	0
Benefits paid	(21,412,000)	(17,224,000)
Effects of change in currency conversion	42,000	(33,000)
Benefit obligation at end of year	303,059,000	277,060,000	253,743,000
Defined Benefit Plan, Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	21,412,000	17,224,000
Lump-sum settlement paid	0	0
Effect of sale of Regional Media Group	0	0
Fair value of plan assets at end of year	0	0	0
Net amount recognized	(303,059,000)	(277,060,000)
Current liabilities	(19,654,000)	(18,784,000)
Noncurrent liabilities	(283,405,000)	(258,276,000)
Actuarial loss	127,387,000	99,130,000
Prior service (credit)/cost	0	0
Total amount recognized in accumulated other comprehensive loss	127,387,000	99,130,000
Pension Plans, Defined Benefit [Member]
Change in benefit obligation
Benefit obligation at beginning of year	2,263,562,000	2,077,368,000
Service cost	13,559,000	13,739,000	13,941,000
Interest cost	109,072,000	113,284,000	116,125,000
Plan participants’ contributions	32,000	34,000
Amendments	(31,839,000)	0
Actuarial loss	197,289,000	165,807,000
Lump-sum settlement paid	(112,404,000)	0
Effect of sale of Regional Media Group	(13,510,000)	0
Benefits paid	(110,752,000)	(106,637,000)
Effects of change in currency conversion	42,000	(33,000)
Benefit obligation at end of year	2,315,051,000	2,263,562,000	2,077,368,000
Defined Benefit Plan, Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year	1,464,729,000	1,381,811,000
Actual return on plan assets	217,371,000	21,712,000
Employer contributions	165,160,000	167,809,000
Lump-sum settlement paid	(112,404,000)	0
Effect of sale of Regional Media Group	(8,413,000)	0
Fair value of plan assets at end of year	1,615,723,000	1,464,729,000	1,381,811,000
Net amount recognized	(699,328,000)	(798,833,000)
Current liabilities	(19,654,000)	(18,784,000)
Noncurrent liabilities	(679,674,000)	(780,049,000)
Actuarial loss	1,014,141,000	1,003,344,000
Prior service (credit)/cost	(30,454,000)	1,959,000
Total amount recognized in accumulated other comprehensive loss	$ 983,687,000	$ 1,005,303,000