Company-Sponsored Employee Benefit Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Mar. 29, 2014	Mar. 30, 2013
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,414,000	$ 17,399,000	$ 7,242,000	$ 52,768,000
Interest cost	40,109,000	36,805,000	120,327,000	111,758,000
Expected return on plan assets	(48,199,000)	(42,801,000)	(144,597,000)	(128,402,000)
Amortization of prior service cost	2,786,000	3,083,000	8,358,000	6,817,000
Amortization of actuarial loss (gain)	4,082,000	17,637,000	12,246,000	54,987,000
Amortization of transition obligation	0	0	0	0
Curtailment loss			0	8,293,000
Net pension costs/ Net other postretirement benefit costs	1,192,000	32,123,000	3,576,000	106,221,000
Employer contributions			18,500,000	17,500,000
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	136,000	135,000	409,000	406,000
Interest cost	187,000	154,000	561,000	461,000
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	42,000	42,000	126,000	126,000
Amortization of actuarial loss (gain)	(36,000)	(51,000)	(108,000)	(152,000)
Amortization of transition obligation	0	35,000	0	106,000
Curtailment loss			0	0
Net pension costs/ Net other postretirement benefit costs	$ 329,000	$ 315,000	$ 988,000	$ 947,000