Company-Sponsored Employee Benefit Plans (Components of Net Benefit Costs and Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 29, 2013
Accumulated other comprehensive loss (income) expected to be recognized as components of net benefit cost
Amortization of prior service cost	$ 11,371
Amortization of actuarial losses (gains)	21,705
Total	33,076
Pension Benefits
Net benefit costs
Service cost	11,263	$ 9,657	$ 70,166
Interest cost	171,120	160,436	148,561
Expected return on plan assets	(228,624)	(192,795)	(171,201)
Amortization of prior service cost	11,111	11,145	9,899
Amortization of actuarial loss	19,871	16,327	72,624
Curtailment loss	0	0	8,293
Net pension costs/ Net other postretirement benefit costs	(15,259)	4,770	138,342
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)
Amortization of prior service cost	11,111	11,145	18,192
Amortization of actuarial loss	19,871	16,327	72,624
Prior service cost arising in current year, before tax	(914)	347	(53,902)
Actuarial (loss) gain arising in current year	(62,270)	(210,978)	366,957
Total changes recognized in other comprehensive (loss) income	(32,202)	(183,159)	403,871
Accumulated other comprehensive loss (income) expected to be recognized as components of net benefit cost
Amortization of prior service cost	11,202
Amortization of actuarial losses (gains)	22,186
Total	33,388
Other Postretirement Plans
Net benefit costs
Service cost	536	546	541
Interest cost	590	748	614
Amortization of prior service cost	168	168	168
Amortization of actuarial loss	(434)	(143)	(203)
Amortization of transition obligation	0	0	141
Net pension costs/ Net other postretirement benefit costs	860	1,319	1,261
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)
Amortization of prior service cost	168	168	168
Amortization of actuarial loss	(434)	(143)	(203)
Amortization of transition obligation	0	0	141
Actuarial (loss) gain arising in current year	1,050	3,280	(188)
Total changes recognized in other comprehensive (loss) income	784	$ 3,305	$ (82)
Accumulated other comprehensive loss (income) expected to be recognized as components of net benefit cost
Amortization of prior service cost	169
Amortization of actuarial losses (gains)	(481)
Total	$ (312)