Company-Sponsored Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 26, 2016	Mar. 28, 2015	Mar. 26, 2016	Mar. 28, 2015
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,902	$ 2,815	$ 8,705	$ 8,445
Interest cost	42,833	42,779	128,498	128,338
Expected return on plan assets	(53,202)	(57,156)	(159,606)	(171,468)
Amortization of prior service cost	2,743	2,778	8,228	8,332
Amortization of actuarial loss (gain)	5,435	4,968	16,305	14,904
Net periodic costs (benefits)	711	(3,816)	2,130	(11,449)
Employer contributions			50,600	68,800
Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	134	134	403	402
Interest cost	153	148	458	444
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	41	42	124	126
Amortization of actuarial loss (gain)	(118)	(109)	(354)	(327)
Net periodic costs (benefits)	$ 210	$ 215	$ 631	$ 645