Company-Sponsored Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 26, 2015	Dec. 27, 2014
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,902	$ 2,815	$ 5,803	$ 5,630
Interest cost	42,833	42,779	85,665	85,558
Expected return on plan assets	(53,202)	(57,156)	(106,404)	(114,312)
Amortization of prior service cost	2,743	2,777	5,486	5,554
Amortization of actuarial loss (gain)	5,435	4,968	10,870	9,936
Net periodic costs (benefits)	711	(3,817)	1,420	(7,634)
Employer contributions			43,700	62,300
Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	134	134	268	268
Interest cost	153	148	305	296
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	41	42	83	84
Amortization of actuarial loss (gain)	(118)	(109)	(236)	(218)
Net periodic costs (benefits)	$ 210	$ 215	$ 420	$ 430