Pension Costs, which Include Costs for Qualified, Nonqualified and Union Plans (Detail) (Pension Plans, Defined Benefit, USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 25, 2011	Sep. 26, 2010	Sep. 25, 2011	Sep. 26, 2010
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost-benefits earned during the period	$ 1,973	$ 3,383	$ 5,919	$ 10,989
Interest cost on benefit obligation	42,253	41,426	126,760	132,913
Expected return on plan assets	(52,262)	(44,787)	(156,785)	(144,210)
Amortization of prior service cost	1,867	1,577	5,601	5,076
Amortization of actuarial loss	9,394	11,567	28,183	36,283
Net periodic cost (benefit)	3,225	13,166	9,678	41,051
Curtailment gain				(582)
Union and other pension cost	998	1,287	2,993	3,860
Pension cost	$ 4,223	$ 14,453	$ 12,671	$ 44,329

Defined Benefit Plan, Curtailment (Gain) Loss

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The total amount of net periodic benefit cost for defined benefit plans plus union and other pension costs for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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The amount of gains or losses recognized in net periodic benefit cost.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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This element may be used to encapsulate any other periodic costs associated with defined benefit plans that are not separately disclosed.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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