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Postretirement Plans - Summary of Changes in Fair Value of Assets With Level 3 Inputs (Detail) - Voluntary Employees Beneficiary Association Plan Assets [Member] - Hedge Funds [Member] $ in Millions	12 Months Ended
	Jan. 03, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	$ 3.6
Unrealized gains attributable to assets held	0.3
Ending balance	$ 3.9

X

- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Unrealized Gains (Losses) Attributable To Assets Held

+ References

No definition available.

+ Details

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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

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X

- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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