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EMPLOYEE BENEFIT PLANS - Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jan. 03, 2015
Compensation and Retirement Disclosure [Abstract]  
Current year actuarial loss $ 195.9us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Amortization of actuarial loss (10.0)swk_DefinedBenefitPlanOtherComprehensiveIncomeAmortizationOfActuarialGainLossDuringPeriodBeforeTax
Prior service cost from plan amendments 0.2us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax
Amortization of prior service costs 0.1us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
Currency / other (27.0)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Total loss recognized in other comprehensive income (pre-tax) $ 159.0us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax