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Debt (Schedule of Borrowings) (Details) (USD $)
In Millions, unless otherwise specified
Jan. 03, 2015
Dec. 28, 2013
Debt Instrument [Line Items]    
Long-term debt $ 900.2us-gaap_LongTermDebt $ 1,150.0us-gaap_LongTermDebt
Capital lease obligations 0.6us-gaap_CapitalLeaseObligations 0us-gaap_CapitalLeaseObligations
Total debt 900.8us-gaap_DebtLongtermAndShorttermCombinedAmount 1,150.0us-gaap_DebtLongtermAndShorttermCombinedAmount
Term Loan A [Member] | October Tenth Two Thousand Eighteen [Member]    
Debt Instrument [Line Items]    
Long-term debt 525.2us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= www_OctoberTenthTwoThousandEighteenMember
/ us-gaap_LongtermDebtTypeAxis
= www_TermLoanAFacilityMemberMember		 775.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= www_OctoberTenthTwoThousandEighteenMember
/ us-gaap_LongtermDebtTypeAxis
= www_TermLoanAFacilityMemberMember
Public Bonds [Member] | October Fifteen Two Thousand Twenty [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 375.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= www_OctoberFifteenTwoThousandTwentyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 $ 375.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= www_OctoberFifteenTwoThousandTwentyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember