Postretirement Benefit Plans - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive (Loss) Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2013	Dec. 30, 2012	Dec. 25, 2011
Comprehensive Income (Loss) [Line Items]
Current year actuarial loss	$ 286,778	$ (230,799)	$ (403,495)
Change in prior service (costs) credit	319	0	(1,297)
Amortization of actuarial loss	64,381	55,372	43,345
Settlement charge	(3,077)	(7,946)	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	9,055	18,107	5,342
Pension and other postretirement benefit items	342,798	(190,357)	(373,672)
Other Postretirement Benefit Plans, Defined Benefit
Comprehensive Income (Loss) [Line Items]
Current year actuarial loss	16,210
Change in prior service (costs) credit	496
Amortization of actuarial loss	1,169
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(9,165)	(19,190)	(19,510)
Pension and other postretirement benefit items	$ 8,710