Accumulated Other Comprehensive Loss (Changes In Other Comprehensive Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2017	Mar. 27, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	$ 1,920,158
Total other comprehensive income, net of tax	13,751	$ 11,867
Balance, end of period	1,993,409	1,892,820
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(565,381)	(615,205)
Other comprehensive income (loss) before reclassifications	3,714	1,785
Income tax (benefit) expense	4,339	2,858
Net other comprehensive income (loss) before reclassifications	8,053	4,643
Total reclassifications before tax	9,050	11,474
Reclassifications from AOCI, Income tax expense (benefit)	(3,352)	(4,250)
Net reclassifications	5,698	7,224
Total other comprehensive income, net of tax	13,751	11,867
Balance, end of period	(551,630)	(603,338)
AOCI Attributable to Parent [Member] | Foreign Currency Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	(2,516)	(856)
AOCI Attributable to Parent [Member] | Commodity Contract
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	(48)	215
AOCI Attributable to Parent [Member] | Treasury Rate Locks
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	90	90
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(68,132)	(58,844)
Other comprehensive income (loss) before reclassifications	15,633	14,571
Income tax (benefit) expense	(76)	(1,878)
Net other comprehensive income (loss) before reclassifications	15,557	12,693
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	15,557	12,693
Balance, end of period	(52,575)	(46,151)
Marketable securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(1,194)	(1,094)
Other comprehensive income (loss) before reclassifications	(16)	(71)
Income tax (benefit) expense	6	26
Net other comprehensive income (loss) before reclassifications	(10)	(45)
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	(10)	(45)
Balance, end of period	(1,204)	(1,139)
Derivative financial instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	12,524	5,886
Other comprehensive income (loss) before reclassifications	(11,903)	(12,715)
Income tax (benefit) expense	4,409	4,710
Net other comprehensive income (loss) before reclassifications	(7,494)	(8,005)
Total reclassifications before tax	(2,474)	(551)
Reclassifications from AOCI, Income tax expense (benefit)	916	204
Net reclassifications	(1,558)	(347)
Total other comprehensive income, net of tax	(9,052)	(8,352)
Balance, end of period	3,472	(2,466)
Derivative financial instruments | Foreign Currency Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	(2,516)	(856)
Derivative financial instruments | Commodity Contract
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	(48)	215
Derivative financial instruments | Treasury Rate Locks
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	90	90
Pension and postretirement benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(508,579)	(561,153)
Other comprehensive income (loss) before reclassifications	0	0
Income tax (benefit) expense	0	0
Net other comprehensive income (loss) before reclassifications	0	0
Total reclassifications before tax	11,524	12,025
Reclassifications from AOCI, Income tax expense (benefit)	(4,268)	(4,454)
Net reclassifications	7,256	7,571
Total other comprehensive income, net of tax	7,256	7,571
Balance, end of period	(501,323)	(553,582)
Pension and postretirement benefit plans - Prior service credits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	(289)	(446)
Pension and postretirement benefit plans - Actuarial losses
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total reclassifications before tax	$ 11,813	$ 12,471