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Recent Accounting Pronouncements - Components of Pension Cost (Income) (Detail) - Accounting Standards Update201707 - Defined Benefit and Post-retirement Plans - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 15, 2017	Jul. 15, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Service cost to be reported in operating income	$ 233	$ 545
Components to be reported outside of operating income	(1,442)	(3,366)
Total pension cost (income)	$ (1,209)	$ (2,821)

X

- Definition

Defined benefit plan costs excluding service cost.

+ References

No definition available.

+ Details

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X

- Definition

Amount of net periodic benefit cost (credit) for defined benefit plan.

+ 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)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ 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)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- 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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