Stock-Based Compensation Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation	$ 25.1us-gaap_ShareBasedCompensation	$ 28.2us-gaap_ShareBasedCompensation	$ 15.0us-gaap_ShareBasedCompensation
Income tax benefits for grants	8.4	9.3	4.9
Maximum expiry period of options granted from the grant date	10 years
Vesting period of options granted	3 years
Lapsing period of restrictions related to restricted stock issued	three- to five-year
Total pretax intrinsic value of options exercised	10.3	12.8	30.1
Closing stock price	$ 29.03www_ClosingStockPrice
Stock options exercisable and in-the-money, number	4,341,758	4,004,398
Stock options exercisable and in-the-money, weighted average exercise price	$ 15.44	$ 13.54
Stock option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to nonvested shares and stock option grants	4.6	4.3	2.9
Weighted-average period of recognition	1 year 2 months 12 days	1 year 3 months 18 days	1 year 2 months 12 days
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to nonvested shares and stock option grants	16.2	13.8	11.6
Weighted-average period of recognition	2 years 0 months 0 days	1 year 10 months 24 days	2 years 1 month 6 days
Total fair value of shares vested	19.5	2.7	14.9
Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to nonvested shares and stock option grants	6.0	8.0	3.5
Weighted-average period of recognition	1 year 3 months 18 days	1 year 2 months 12 days	1 year 2 months 12 days
Total fair value of shares vested	$ 6.6	$ 0.6	$ 17.5
Available For Issuance [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive units	7,664,828.0
Option Or Stock Appreciation Right [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive units	1
Non-Stock Option Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive units	2.6
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lapsing Period Of Restrictions Related To Restricted Stock Issued1	3 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lapsing Period Of Restrictions Related To Restricted Stock Issued1	5 years

Unrecognized cost of unvested share-based compensation awards.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Maximum expiry period of options granted from the grant date.

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Share based compensation arrangement by share based payment award in-the-money options exercisable number.

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Share based compensation arrangement by share based payment award in-the-money options exercisable weighted average exercise price.

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Stock incentive units.

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