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Components of Net Periodic Benefit (Income) Cost (Detail) (USD $) In Thousands, unless otherwise specified	4 Months Ended
	Apr. 20, 2013	Apr. 21, 2012
Net Periodic Pension Cost
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 218	$ 188
Interest cost	6,181	6,668
Expected return on plan assets	(8,825)	(8,094)
Amortization of net (gain) loss	1,901	1,565
Total net periodic benefit (income) cost	(525)	327
Net Periodic Postretirement Benefit Cost
Defined Benefit Plan Disclosure [Line Items]
Service cost	105	141
Interest cost	117	186
Amortization of net (gain) loss	(246)	(92)
Amortization of prior service (credit) cost	(79)	(79)
Total net periodic benefit (income) cost	$ (103)	$ 156

X

- Definition

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

+ References

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-Name Statement of Financial Accounting Standard (FAS)

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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.

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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.

+ References

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-Number 132R

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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