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Financing Receivables - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Dec. 28, 2013
Jan. 03, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of Days Before Considered Past Due or Delinquent 90 days      
Net receivables derecognized $ 77.1us-gaap_DerecognizedAssetsSecuritizedOrAssetbackedFinancingArrangementAssetsAndAnyOtherFinancialAssetsManagedTogetherPrincipalAmountOutstanding     $ 100.3us-gaap_DerecognizedAssetsSecuritizedOrAssetbackedFinancingArrangementAssetsAndAnyOtherFinancialAssetsManagedTogetherPrincipalAmountOutstanding
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale 0.8us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale      
Proceeds from transfers of receivables to the purchaser 245.0us-gaap_CashFlowsBetweenTransfereeAndTransferorProceedsFromNewTransfers 231.6us-gaap_CashFlowsBetweenTransfereeAndTransferorProceedsFromNewTransfers    
Payment to the Purchaser 268.3swk_CashFlowsBetweenTransferorAndTransfereePaymentToPurchaser 246.0swk_CashFlowsBetweenTransferorAndTransfereePaymentToPurchaser    
Sale of receivables, deferred purchase price 112.7us-gaap_SupplementalDeferredPurchasePrice   21.7us-gaap_SupplementalDeferredPurchasePrice  
Cash inflows related to the deferred purchase price receivable 89.0us-gaap_CashFlowsBetweenTransfereeAndTransferorReceiptsOnInterestsThatContinueToBeHeldOther 80.9us-gaap_CashFlowsBetweenTransfereeAndTransferorReceiptsOnInterestsThatContinueToBeHeldOther    
Gross receivables sold        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Receivables sold 336.1swk_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleAssetsSold
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= swk_ReceivablesMember
296.1swk_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleAssetsSold
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= swk_ReceivablesMember
   
Net receivables sold        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Receivables sold 299.4swk_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleAssetsSold
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= swk_ReceivablesNetMember
273.4swk_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleAssetsSold
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= swk_ReceivablesNetMember
   
Other assets        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Long-term trade financing receivables 167.0us-gaap_LongTermAccountsNotesAndLoansReceivableNetNoncurrent
/ swk_BalanceSheetLineItemAxis
= us-gaap_OtherAssetsMember
    169.5us-gaap_LongTermAccountsNotesAndLoansReceivableNetNoncurrent
/ swk_BalanceSheetLineItemAxis
= us-gaap_OtherAssetsMember
Maximum [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Cash investment purchaser allowed to have in transferors receivables 100.0swk_CashInvestmentPurchaserAllowedToHaveInTransferorsReceivables
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Payment to the Purchaser, servicing fees $ 0.1us-gaap_CashFlowsBetweenTransfereeAndTransferorServicingFees
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 0.1us-gaap_CashFlowsBetweenTransfereeAndTransferorServicingFees
/ us-gaap_RangeAxis
= us-gaap_MaximumMember