Pension and Other Postretirement Benefits (Details) (USD $)	0 Months Ended	3 Months Ended	6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Apr. 25, 2014	Jun. 29, 2014	Jun. 29, 2014	Apr. 25, 2014	Jun. 29, 2014 Qualified Plans [Member]	Jun. 30, 2013 Qualified Plans [Member]	Jun. 29, 2014 Qualified Plans [Member]	Jun. 30, 2013 Qualified Plans [Member]	Jun. 29, 2014 Non-Qualified Plans [Member]	Jun. 30, 2013 Non-Qualified Plans [Member]	Jun. 29, 2014 Non-Qualified Plans [Member]	Jun. 30, 2013 Non-Qualified Plans [Member]	Jun. 29, 2014 Pension Plans, Defined Benefit [Member]	Jun. 30, 2013 Pension Plans, Defined Benefit [Member]	Jun. 29, 2014 Pension Plans, Defined Benefit [Member]	Jun. 30, 2013 Pension Plans, Defined Benefit [Member]	Jun. 29, 2014 Other Postretirement Benefit Plan, Defined Benefit [Member]	Jun. 30, 2013 Other Postretirement Benefit Plan, Defined Benefit [Member]	Jun. 29, 2014 Other Postretirement Benefit Plan, Defined Benefit [Member]	Jun. 30, 2013 Other Postretirement Benefit Plan, Defined Benefit [Member]
Net periodic benefit cost/(income)
Service cost					$ 2,385,000	$ 2,323,000	$ 4,772,000	$ 4,645,000	$ 0	$ 256,000	$ 0	$ 512,000	$ 2,385,000	$ 2,579,000	$ 4,772,000	$ 5,157,000	$ 147,000	$ 285,000	$ 294,000	$ 570,000
Interest cost					21,112,000	19,284,000	42,224,000	38,568,000	2,711,000	2,643,000	5,586,000	5,286,000	23,823,000	21,927,000	47,810,000	43,854,000	1,010,000	1,009,000	2,020,000	2,018,000
Expected return on plan assets					(28,460,000)	(31,063,000)	(56,920,000)	(62,125,000)	0	0	0	0	(28,460,000)	(31,063,000)	(56,920,000)	(62,125,000)
Amortization of prior service credit					(484,000)	(486,000)	(970,000)	(972,000)	0	0	0	0	(484,000)	(486,000)	(970,000)	(972,000)	(1,600,000)	(3,693,000)	(3,200,000)	(7,385,000)
Amortization of actuarial loss					6,711,000	8,442,000	13,309,000	16,884,000	1,033,000	1,312,000	2,087,000	2,623,000	7,744,000	9,754,000	15,396,000	19,507,000	1,184,000	1,022,000	2,368,000	2,044,000
Effect of settlement		9,500,000			0	0	0	0	9,525,000	0	9,525,000	0	9,525,000	0	9,525,000	0
Net periodic benefit cost/(income)					1,264,000	(1,500,000)	2,415,000	(3,000,000)	13,269,000	4,211,000	17,198,000	8,421,000	14,533,000	2,711,000	19,613,000	5,421,000	741,000	(1,377,000)	1,482,000	(2,753,000)
Contributions to certain qualified pension plans							9,000,000
Estimated future contributions to pension plans based on contractual obligations for the remaining fiscal year			16,000,000
Pension plan, estimated settlement charge	9,500,000
Pension plan, settlement distributions if estimated acceptance rate met	24,000,000
Estimated increase in liability due to new guidance		150,000,000	150,000,000
Estimated increase in expense due to new guidance		10,000,000	10,000,000
Liabilities settled				$ 32,000,000