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. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Comprehensive Income (Loss) [Line Items]
Current year actuarial gain (loss)	$ (500,389)	$ 286,778	$ (230,799)
Amortization of actuarial loss	46,489	64,381	55,372
Amortization of prior service costs	37,986	319	0
Pension and other postretirement benefit items	(396,368)	342,798	(190,357)
Retirement Plans
Comprehensive Income (Loss) [Line Items]
Current year actuarial gain (loss)	(493,124)
Amortization of actuarial loss	45,731
Amortization of prior service costs	7,566
Foreign currency gain	26,511
Pension and other postretirement benefit items	$ (413,316)

Amount before tax of cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that has not been recognized in net periodic benefit cost (credit).

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Amount before tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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- Definition

Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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