Pension Costs, which Include Costs for Qualified, Nonqualified and Union Plans (Detail) (Pension Plans, Defined Benefit, USD $) In Thousands, unless otherwise specified	1 Months Ended	12 Months Ended
Oct. 31, 2010	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost-benefits earned during the period		$ 7,545	$ 7,833	$ 14,829
Interest cost on benefit obligation		155,376	171,339	176,738
Expected return on plan assets		(189,863)	(211,659)	(191,614)
Amortization of prior service costs		7,689	7,580	6,731
Amortization of actuarial loss		53,429	37,901	46,870
Net periodic (benefit) cost		34,176	12,994	53,554
Curtailment gains	3,300	0	0	(3,840)
Settlement and special termination benefit charge/(credit)		7,946	1,068	0
Total pension cost (benefit)		$ 42,122	$ 14,062	$ 49,714

Defined Benefit Plan, Curtailment (Gain) Loss

No definition available.

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- Definition

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.

+ References

No definition available.

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

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- Definition

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.

+ References

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- Definition

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.

+ References

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- Definition

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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- Definition

Amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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- Definition

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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