Other Comprehensive Income - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016	Jul. 01, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Comprehensive income	$ 310,664	$ 127,511	$ 798,462	$ 374,576	$ 1,237,884
Before Tax Amount
Total other comprehensive income	29,698	(119,226)	145,101	(189,922)
Tax
Total other comprehensive income	3,147	28,430	(1,607)	34,556
Net of Tax Amount
Total other comprehensive income (loss)	26,551	(147,656)	146,709	(224,478)	$ 95,381
Pension and other postretirement benefit plans: | Operating expenses
Before Tax Amount
Reclassification adjustments, before tax	11,170	12,593	22,340	28,896
Tax
Amortization of prior service cost	2,792	5,023	7,081	10,046
Net of Tax Amount
Amortization of prior service cost	8,378	7,570	15,259	18,850
Amortization of prior service cost
Net of Tax Amount
Amortization of prior service cost			3,291	3,504
Amortization of prior service cost | Operating expenses
Before Tax Amount
Reclassification adjustments, before tax	2,409	2,844	4,818	5,688
Tax
Amortization of prior service cost	602	1,092	1,527	2,184
Net of Tax Amount
Amortization of prior service cost	1,807	1,752	3,291	3,504
Amortization of actuarial loss (gain), net
Net of Tax Amount
Amortization of prior service cost			11,968	15,346
Amortization of actuarial loss (gain), net | Operating expenses
Before Tax Amount
Reclassification adjustments, before tax	8,761	9,749	17,522	23,208
Tax
Amortization of prior service cost	2,190	3,931	5,554	7,862
Net of Tax Amount
Amortization of prior service cost	6,571	5,818	11,968	15,346
Foreign currency translation:
Before Tax Amount
Other comprehensive income before reclassifications, before tax	19,254	(202,195)	140,584	(279,683)
Tax
Foreign currency translation adjustment	0	0	0	0
Net of Tax Amount
Foreign currency translation adjustment	19,254	(202,195)	140,584	(279,683)
Hedging, net of tax
Before Tax Amount
Other comprehensive income before reclassifications, before tax	(3,599)	67,503	(23,569)	55,119
Tax
Foreign currency translation adjustment	(363)	22,304	(10,509)	22,304
Net of Tax Amount
Foreign currency translation adjustment	(3,236)	45,199	(13,059)	32,815
Amortization of cash flow hedges
Before Tax Amount
Other comprehensive income before reclassifications, before tax	2,944	12,058	6,350	11,739
Tax
Foreign currency translation adjustment	2,027	4,185	3,232	4,185
Net of Tax Amount
Amortization of prior service cost			(3,925)	(3,540)
Foreign currency translation adjustment	917	7,873	3,118	7,554
Amortization of cash flow hedges | Interest expense
Before Tax Amount
Reclassification adjustments, before tax	2,873	2,873	5,746	5,746
Tax
Amortization of prior service cost	718	1,103	1,821	2,206
Net of Tax Amount
Amortization of prior service cost	2,155	1,770	3,925	3,540
Change in net investment hedge
Before Tax Amount
Other comprehensive income before reclassifications, before tax	(6,543)	55,445	(29,919)	43,380
Tax
Foreign currency translation adjustment	(2,390)	18,119	(13,741)	18,119
Net of Tax Amount
Foreign currency translation adjustment	$ (4,153)	$ 37,326	(16,177)	$ 25,261
Change in fuel hedge
Before Tax Amount
Other comprehensive income before reclassifications, before tax			0
Net of Tax Amount
Foreign currency translation adjustment			$ 0