Accumulated Other Comprehensive Loss (Changes In Other Comprehensive Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 24, 2017	Sep. 25, 2016	Sep. 24, 2017	Sep. 25, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			$ 1,920,158
Total other comprehensive income, net of tax	$ 14,863	$ 9,383	36,299	$ 34,427
Balance, end of period	1,856,820	1,992,368	1,856,820	1,992,368
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(543,945)	(590,161)	(565,381)	(615,205)
Other comprehensive income (loss) before reclassifications	(8,938)	2,661	(6,515)	15,046
Income tax (benefit) expense	11,479	618	19,978	593
Net other comprehensive income (loss) before reclassifications	2,541	3,279	13,463	15,639
Total reclassifications before tax	19,569	9,696	36,268	29,841
Reclassifications from AOCI, Income tax expense (benefit)	(7,247)	(3,592)	(13,432)	(11,053)
Net reclassifications	12,322	6,104	22,836	18,788
Total other comprehensive income, net of tax	14,863	9,383	36,299	34,427
Balance, end of period	(529,082)	(580,778)	(529,082)	(580,778)
AOCI Attributable to Parent [Member] | Foreign Currency Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	7,901	(2,399)	1,428	(6,806)
AOCI Attributable to Parent [Member] | Commodity Contract
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	16	(21)	(49)	298
AOCI Attributable to Parent [Member] | Treasury Rate Locks
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	126	90	315	271
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(42,938)	(43,523)	(68,132)	(58,844)
Other comprehensive income (loss) before reclassifications	26,754	3,574	51,834	20,661
Income tax (benefit) expense	(1,741)	279	(1,627)	(1,487)
Net other comprehensive income (loss) before reclassifications	25,013	3,853	50,207	19,174
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	25,013	3,853	50,207	19,174
Balance, end of period	(17,925)	(39,670)	(17,925)	(39,670)
Marketable securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	0	(1,171)	(1,194)	(1,094)
Other comprehensive income (loss) before reclassifications	0	(18)	1,896	(140)
Income tax (benefit) expense	0	7	(702)	52
Net other comprehensive income (loss) before reclassifications	0	(11)	1,194	(88)
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	0	(11)	1,194	(88)
Balance, end of period	0	(1,182)	0	(1,182)
Derivative financial instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(6,940)	543	12,524	5,886
Other comprehensive income (loss) before reclassifications	(35,692)	(895)	(60,245)	(5,475)
Income tax (benefit) expense	13,220	332	22,307	2,028
Net other comprehensive income (loss) before reclassifications	(22,472)	(563)	(37,938)	(3,447)
Total reclassifications before tax	8,043	(2,330)	1,694	(6,237)
Reclassifications from AOCI, Income tax expense (benefit)	(2,978)	862	(627)	2,310
Net reclassifications	5,065	(1,468)	1,067	(3,927)
Total other comprehensive income, net of tax	(17,407)	(2,031)	(36,871)	(7,374)
Balance, end of period	(24,347)	(1,488)	(24,347)	(1,488)
Derivative financial instruments | Foreign Currency Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	7,901	(2,399)	1,428	(6,806)
Derivative financial instruments | Commodity Contract
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	16	(21)	(49)	298
Derivative financial instruments | Treasury Rate Locks
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	126	90	315	271
Pension and postretirement benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(494,067)	(546,010)	(508,579)	(561,153)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Income tax (benefit) expense	0	0	0	0
Net other comprehensive income (loss) before reclassifications	0	0	0	0
Total reclassifications before tax	11,526	12,026	34,574	36,078
Reclassifications from AOCI, Income tax expense (benefit)	(4,269)	(4,454)	(12,805)	(13,363)
Net reclassifications	7,257	7,572	21,769	22,715
Total other comprehensive income, net of tax	7,257	7,572	21,769	22,715
Balance, end of period	(486,810)	(538,438)	(486,810)	(538,438)
Pension and postretirement benefit plans - Prior service credits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	(287)	(446)	(865)	(1,338)
Pension and postretirement benefit plans - Actuarial losses
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	$ 11,813	$ 12,472	$ 35,439	$ 37,416