Accumulated Other Comprehensive Loss (Changes In Other Comprehensive Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2017	Jun. 26, 2016	Jun. 25, 2017	Jun. 26, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			$ 1,920,158
Total other comprehensive income, net of tax	$ 7,685	$ 13,177	21,436	$ 25,044
Balance, end of period	2,046,167	2,021,007	2,046,167	2,021,007
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(551,630)	(603,338)	(565,381)	(615,205)
Other comprehensive income (loss) before reclassifications	(1,291)	10,601	2,423	12,385
Income tax expense (benefit)	4,160	(2,883)	8,499	(25)
Net other comprehensive income (loss) before reclassifications	2,869	7,718	10,922	12,360
Total reclassifications before tax	7,649	8,669	16,699	20,145
Reclassifications from AOCI, Income tax expense (benefit)	(2,833)	(3,210)	(6,185)	(7,461)
Net reclassifications	4,816	5,459	10,514	12,684
Total other comprehensive income, net of tax	7,685	13,177	21,436	25,044
Balance, end of period	(543,945)	(590,161)	(543,945)	(590,161)
AOCI Attributable to Parent [Member] | Foreign Currency Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	(3,957)	(3,551)	(6,473)	(4,407)
AOCI Attributable to Parent [Member] | Commodity Contract
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	(17)	104	(65)	319
AOCI Attributable to Parent [Member] | Treasury Rate Locks
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	99	90	189	181
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(52,575)	(46,151)	(68,132)	(58,844)
Other comprehensive income (loss) before reclassifications	9,447	2,516	25,080	17,087
Income tax expense (benefit)	190	112	114	(1,766)
Net other comprehensive income (loss) before reclassifications	9,637	2,628	25,194	15,321
Total reclassifications before tax	0	0	0	0
Reclassifications from AOCI, Income tax expense (benefit)	0	0	0	0
Net reclassifications	0	0	0	0
Total other comprehensive income, net of tax	9,637	2,628	25,194	15,321
Balance, end of period	(42,938)	(43,523)	(42,938)	(43,523)
Marketable securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(1,204)	(1,139)	(1,194)	(1,094)
Other comprehensive income (loss) before reclassifications	1,912	(51)	1,896	(122)
Income tax expense (benefit)	(708)	19	(702)	45
Net other comprehensive income (loss) before reclassifications	1,204	(32)	1,194	(77)
Total reclassifications before tax	0	0	0	0
Reclassifications from AOCI, Income tax expense (benefit)	0	0	0	0
Net reclassifications	0	0	0	0
Total other comprehensive income, net of tax	1,204	(32)	1,194	(77)
Balance, end of period	0	(1,171)	0	(1,171)
Derivative financial instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	3,472	(2,466)	12,524	5,886
Other comprehensive income (loss) before reclassifications	(12,650)	8,136	(24,553)	(4,580)
Income tax expense (benefit)	4,678	(3,014)	9,087	1,696
Net other comprehensive income (loss) before reclassifications	(7,972)	5,122	(15,466)	(2,884)
Total reclassifications before tax	(3,875)	(3,357)	(6,349)	(3,907)
Reclassifications from AOCI, Income tax expense (benefit)	1,435	1,244	2,351	1,448
Net reclassifications	(2,440)	(2,113)	(3,998)	(2,459)
Total other comprehensive income, net of tax	(10,412)	3,009	(19,464)	(5,343)
Balance, end of period	(6,940)	543	(6,940)	543
Derivative financial instruments | Foreign Currency Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	(3,957)	(3,551)	(6,473)	(4,407)
Derivative financial instruments | Commodity Contract
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	(17)	104	(65)	319
Derivative financial instruments | Treasury Rate Locks
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	99	90	189	181
Pension and postretirement benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(501,323)	(553,582)	(508,579)	(561,153)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Income tax expense (benefit)	0	0	0	0
Net other comprehensive income (loss) before reclassifications	0	0	0	0
Total reclassifications before tax	11,524	12,026	23,048	24,052
Reclassifications from AOCI, Income tax expense (benefit)	(4,268)	(4,454)	(8,536)	(8,909)
Net reclassifications	7,256	7,572	14,512	15,143
Total other comprehensive income, net of tax	7,256	7,572	14,512	15,143
Balance, end of period	(494,067)	(546,010)	(494,067)	(546,010)
Pension and postretirement benefit plans - Prior service credits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	(289)	(446)	(578)	(892)
Pension and postretirement benefit plans - Actuarial losses
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	$ 11,813	$ 12,472	$ 23,626	$ 24,944