Employee Benefit Plans (Components Of Net Periodic Benefit Costs) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Pension And SERPA Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8,997	$ 8,420	$ 26,990	$ 25,260
Interest cost	19,812	20,816	59,436	62,448
Expected return on plan assets	(31,832)	(29,277)	(95,496)	(87,832)
Prior service cost	437	740	1,310	2,219
Net loss	14,652	10,969	43,956	32,906
Net periodic benefit cost	12,066	11,668	36,196	35,001
Postretirement Healthcare Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,965	1,854	5,894	5,560
Interest cost	3,900	4,578	11,699	13,733
Expected return on plan assets	(2,384)	(2,356)	(7,153)	(7,068)
Prior service cost	(963)	(963)	(2,890)	(2,890)
Net loss	2,137	1,855	6,412	5,566
Net periodic benefit cost	$ 4,655	$ 4,968	$ 13,962	$ 14,901