Company-Sponsored Employee Benefit Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 27, 2014	Dec. 28, 2013
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,815,000	$ 2,414,000	$ 5,630,000	$ 4,828,000
Interest cost	42,779,000	40,109,000	85,558,000	80,218,000
Expected return on plan assets	(57,156,000)	(48,199,000)	(114,312,000)	(96,398,000)
Amortization of prior service cost	2,777,000	2,786,000	5,554,000	5,572,000
Amortization of actuarial loss (gain)	4,968,000	4,082,000	9,936,000	8,164,000
Amortization of transition obligation	0	0
Net pension costs/ Net other postretirement benefit costs	(3,817,000)	1,192,000	(7,634,000)	2,384,000
Employer contributions			62,300,000	11,700,000
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	134,000	136,000	268,000	272,000
Interest cost	148,000	187,000	296,000	374,000
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	42,000	42,000	84,000	84,000
Amortization of actuarial loss (gain)	(109,000)	(36,000)	(218,000)	(72,000)
Amortization of transition obligation	0	0
Net pension costs/ Net other postretirement benefit costs	$ 215,000	$ 329,000	$ 430,000	$ 658,000