Pension Benefits - Net Periodic Pension Cost (Details) (USD $)	3 Months Ended																12 Months Ended
	Dec. 28, 2014		Sep. 28, 2014		Jun. 29, 2014		Mar. 30, 2014		Dec. 29, 2013		Sep. 29, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 28, 2014		Dec. 29, 2013		Dec. 30, 2012
Pension Benefits
Pension settlement charge	$ 0	[1]	$ 0	[1]	$ 9,525,000	[1]	$ 0	[1]	$ 3,228,000	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 9,525,000	[1]	$ 3,228,000	[1]	$ 47,657,000
Pension settlement charge																	9,500,000
Accumulated Other Comprehensive Income (Loss) [Member]
Pension Benefits
Change in projected benfit obligation																			32,000,000
Change in funded status																			32,000,000
Qualified Plans [Member]
Pension Benefits
Service cost																	9,543,000		11,225,000		11,903,000
Interest cost																	84,447,000		77,136,000		94,113,000
Expected return on plan assets																	(113,839,000)		(124,250,000)		(118,551,000)
Amortization and other costs																	26,620,000		33,770,000		33,323,000
Amortization of prior service (credit)/cost																	(1,945,000)		(1,945,000)		574,000
Effect of settlement																	0		0		47,657,000
Effect of sale of Regional Media Group																	0		0		(5,097,000)
Net periodic postretirement benefit expense/(income)																	4,826,000		(4,064,000)		63,922,000
Pension settlement charge																	0		0
Lump-sum payments to be made from plan assets																	0		0
Non-Qualified Plans [Member]
Pension Benefits
Service cost																	184,000		1,162,000		1,656,000
Interest cost																	10,450,000		10,681,000		12,635,000
Expected return on plan assets																	0		0		0
Amortization and other costs																	4,718,000		5,561,000		4,489,000
Amortization of prior service (credit)/cost																	0		0		0
Effect of settlement																	9,525,000		3,228,000		0
Effect of sale of Regional Media Group																	0		0		0
Net periodic postretirement benefit expense/(income)																	24,877,000		20,632,000		18,780,000
Pension settlement charge																	24,015,000		10,667,000
Lump-sum payments to be made from plan assets																	24,015,000		10,667,000
Pension Plans, Defined Benefit [Member]
Pension Benefits
Service cost																	9,727,000		12,387,000		13,559,000
Interest cost																	94,897,000		87,817,000		106,748,000
Expected return on plan assets																	(113,839,000)		(124,250,000)		(118,551,000)
Amortization and other costs																	31,338,000		39,331,000		37,812,000
Amortization of prior service (credit)/cost																	(1,945,000)		(1,945,000)		574,000
Effect of settlement																	9,525,000		3,228,000		47,657,000
Effect of sale of Regional Media Group																	0		0		(5,097,000)
Net periodic postretirement benefit expense/(income)																	29,703,000		16,568,000		82,702,000
Pension settlement charge																	24,015,000		10,667,000
Lump-sum payments to be made from plan assets																	$ 24,015,000		$ 10,667,000		$ 112,000,000

[1] We recorded a settlement charge related to a lump-sum payment offer to certain former employees who participated in a non-qualified pension plan.