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Components of Net Periodic Benefit (Income) Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 18, 2015	Jul. 12, 2014	Jul. 18, 2015	Jul. 12, 2014
Net Periodic Pension Cost
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 201	$ 148	$ 470	$ 345
Interest cost	4,155	4,944	9,694	11,537
Expected return on plan assets	(6,840)	(7,804)	(15,961)	(18,209)
Amortization of net (gain) loss	1,149	444	2,681	1,036
Total net periodic benefit (income) cost	(1,335)	(2,268)	(3,116)	(5,291)
Net Periodic Post-Retirement Benefit Cost
Defined Benefit Plan Disclosure [Line Items]
Service cost	93	87	215	203
Interest cost	82	103	194	240
Amortization of prior service (credit) cost	(108)	(108)	(252)	(252)
Amortization of net (gain) loss	(135)	(133)	(315)	(311)
Total net periodic benefit (income) cost	$ (68)	$ (51)	$ (158)	$ (120)

X

- Definition

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

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (h)(4)



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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

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



-Publisher FASB



-Name Accounting Standards Codification



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-Glossary Prior Service Cost



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X

- Definition

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.

+ References

No definition available.

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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

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



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Expected Return on Plan Assets



-URI http://asc.fasb.org/extlink&oid=6512171



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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.

+ References

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- Definition

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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- 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 Accounting Standards Codification



-Glossary Service Cost (Component of Net Periodic Pension Cost)



-URI http://asc.fasb.org/extlink&oid=6525008



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