Accumulated Other Comprehensive Loss (Changes In Other Comprehensive Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Mar. 26, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	$ 1,844,277
Total other comprehensive income, net of tax	93,445	$ 13,751
Balance, end of period	1,995,949	1,993,409
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(500,049)	(565,381)
Other comprehensive income (loss) before reclassifications	97,383	3,714
Income tax (benefit) expense	(21,242)	4,339
Net other comprehensive income (loss) before reclassifications	76,141	8,053
Total reclassifications before tax	22,615	9,050
Reclassifications from AOCI, Income tax expense (benefit)	(5,311)	(3,352)
Net reclassifications	17,304	5,698
Total other comprehensive income, net of tax	93,445	13,751
Balance, end of period	(406,604)	(551,630)
AOCI Attributable to Parent [Member] | Foreign Currency Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	6,709	(2,516)
AOCI Attributable to Parent [Member] | Commodity Contract
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	73	(48)
AOCI Attributable to Parent [Member] | Treasury Rate Locks
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	126	90
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(21,852)	(68,132)
Other comprehensive income (loss) before reclassifications	6,915	15,633
Income tax (benefit) expense	0	(76)
Net other comprehensive income (loss) before reclassifications	6,915	15,557
Total reclassifications before tax	0	0
Reclassifications from AOCI, Income tax expense (benefit)	0	0
Net reclassifications	0	0
Total other comprehensive income, net of tax	6,915	15,557
Balance, end of period	(14,937)	(52,575)
Marketable securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	0	(1,194)
Other comprehensive income (loss) before reclassifications	0	(16)
Income tax (benefit) expense	0	6
Net other comprehensive income (loss) before reclassifications	0	(10)
Total reclassifications before tax	0	0
Reclassifications from AOCI, Income tax expense (benefit)	0	0
Net reclassifications	0	0
Total other comprehensive income, net of tax	0	(10)
Balance, end of period	0	(1,204)
Derivative financial instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(17,254)	12,524
Other comprehensive income (loss) before reclassifications	(5,906)	(11,903)
Income tax (benefit) expense	1,387	4,409
Net other comprehensive income (loss) before reclassifications	(4,519)	(7,494)
Total reclassifications before tax	6,908	(2,474)
Reclassifications from AOCI, Income tax expense (benefit)	(1,624)	916
Net reclassifications	5,284	(1,558)
Total other comprehensive income, net of tax	765	(9,052)
Balance, end of period	(16,489)	3,472
Derivative financial instruments | Foreign Currency Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	6,709	(2,516)
Derivative financial instruments | Commodity Contract
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	73	(48)
Derivative financial instruments | Treasury Rate Locks
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	126	90
Pension and postretirement benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(460,943)	(508,579)
Other comprehensive income (loss) before reclassifications	96,374	0
Income tax (benefit) expense	(22,629)	0
Net other comprehensive income (loss) before reclassifications	73,745	0
Total reclassifications before tax	15,707	11,524
Reclassifications from AOCI, Income tax expense (benefit)	(3,687)	(4,268)
Net reclassifications	12,020	7,256
Total other comprehensive income, net of tax	85,765	7,256
Balance, end of period	(375,178)	(501,323)
Pension and postretirement benefit plans - Prior service credits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	(566)	(289)
Pension and postretirement benefit plans - Actuarial losses
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	$ 16,273	$ 11,813