Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

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Amounts payable to defined benefit plan sponsor as of balance sheet date.

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Retirement Plans - Asset Allocations (Detail) (USD $) In Millions, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	$ 302.1	$ 319.6	$ 277.3
Expenses payable to plan sponsor		(1.2)www_DefinedBenefitPlanExpensesPayable
Equity securities, Percentage	100.00%	100.00%
Level 1 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets		43.5
Level 2 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	301.5	277.3
Fair Value, Inputs, Level 3 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	0.6
Equity securities [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	195.6	211.5
Equity securities, Percentage	64.70%	66.00%
Equity securities [Member] \| Level 1 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets		15.4
Equity securities [Member] \| Level 2 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	195.6	196.1
Equity securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	0
Fixed income securities [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	106.2	107.9
Equity securities, Percentage	35.20%	33.60%
Fixed income securities [Member] \| Level 1 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets		26.7
Fixed income securities [Member] \| Level 2 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	105.9	81.2
Fixed income securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	0.3
Cash and Cash Equivalents [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets		1.4
Equity securities, Percentage		0.40%
Cash and Cash Equivalents [Member] \| Level 1 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets		1.4
Cash and Cash Equivalents [Member] \| Level 2 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets		0
Other Investments [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	0.3
Equity securities, Percentage	0.10%
Other Investments [Member] \| Level 2 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	0
Other Investments [Member] \| Fair Value, Inputs, Level 3 [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	0.3
Subtotal [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Fair value of plan assets	$ 302.1	$ 320.8