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DISCONTINUED OPERATIONS - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended 1 Months Ended 0 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Sep. 28, 2013
Entity
Dec. 29, 2012
Oct. 31, 2012
Dec. 17, 2012
Apr. 08, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Income Tax Expense (Benefit) Related to Sale of Business $ (19.1)swk_IncomeTaxExpenseBenefitRelatedtoSaleofBusiness              
(Payments) proceeds from sales of businesses, net of cash sold (3.9)us-gaap_ProceedsFromDivestitureOfBusinesses 93.5us-gaap_ProceedsFromDivestitureOfBusinesses 1,260.6us-gaap_ProceedsFromDivestitureOfBusinesses          
Assets held for sale 29.5us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent 136.9us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent            
Other Businesses [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Impairment of Long-Lived Assets to be Disposed of   22.2us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_StatementBusinessSegmentsAxis
= swk_OtherBusinessesMember
           
Number Of Entities Classified As Held for Sale   2swk_NumberOfEntitiesClassifiedAsHeldforSale
/ us-gaap_StatementBusinessSegmentsAxis
= swk_OtherBusinessesMember
  2swk_NumberOfEntitiesClassifiedAsHeldforSale
/ us-gaap_StatementBusinessSegmentsAxis
= swk_OtherBusinessesMember
       
Assets held for sale   136.9us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= swk_OtherBusinessesMember
           
Liabilities held for sale   61.0us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= swk_OtherBusinessesMember
           
Security Spain & Italy [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Impairment of Long-Lived Assets to be Disposed of 60.7us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= swk_SecuritySpainItalyMember
             
Hardware & Home Improvement                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
(Payments) proceeds from sales of businesses, net of cash sold         1,400.0us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= swk_HardwareAndHomeImprovementMember
1,400.0us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= swk_HardwareAndHomeImprovementMember
   
Gain (loss) from sale of businesses         (358.9)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= swk_HardwareAndHomeImprovementMember
     
First closing | Hardware & Home Improvement                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Gain (loss) from sale of businesses             (358.9)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ swk_DisposalGroupClosingTypeAxis
= swk_FirstClosingMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= swk_HardwareAndHomeImprovementMember
 
Second closing | Tong Lung                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
(Payments) proceeds from sales of businesses, net of cash sold               93.5us-gaap_ProceedsFromDivestitureOfBusinesses
/ swk_DisposalGroupClosingTypeAxis
= swk_SecondClosingMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= swk_TongLungMemberMember
Gain (loss) from sale of businesses               $ (4.7)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ swk_DisposalGroupClosingTypeAxis
= swk_SecondClosingMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= swk_TongLungMemberMember