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MERGER AND ACQUISITIONS - Estimated Fair Values of Major Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Millions, unless otherwise specified
Jan. 03, 2015
Dec. 28, 2013
May 28, 2013
Business Acquisition [Line Items]      
Goodwill $ 7,275.5us-gaap_Goodwill $ 7,562.7us-gaap_Goodwill  
GQ [Member]      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents     3.5us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= swk_GQMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     20.4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= swk_GQMember
Total identifiable net assets     (10.8)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= swk_GQMember
Goodwill     $ 92.6us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= swk_GQMember