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GOODWILL AND INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill by Segment (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jan. 03, 2015
Goodwill  
Balance December 28, 2013 $ 7,562.7us-gaap_Goodwill
Acquisition adjustments 74.5us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency translation and other (361.7)us-gaap_GoodwillTranslationAdjustments
Balance January 3, 2014 7,275.5us-gaap_Goodwill
Construction and Do It Yourself  
Goodwill  
Balance December 28, 2013 2,951.2us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_ConstructionAndDoItYourselfMember
Acquisition adjustments 24.5us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= swk_ConstructionAndDoItYourselfMember
Foreign currency translation and other (99.0)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= swk_ConstructionAndDoItYourselfMember
Balance January 3, 2014 2,876.7us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_ConstructionAndDoItYourselfMember
Industrial Segment  
Goodwill  
Balance December 28, 2013 2,026.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_IndustrialSegmentMember
Acquisition adjustments 48.9us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= swk_IndustrialSegmentMember
Foreign currency translation and other (79.0)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= swk_IndustrialSegmentMember
Balance January 3, 2014 1,995.9us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_IndustrialSegmentMember
Securities Industry [Member]  
Goodwill  
Balance December 28, 2013 2,585.5us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_SecuritiesIndustryMember
Acquisition adjustments 1.1us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= swk_SecuritiesIndustryMember
Foreign currency translation and other (183.7)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= swk_SecuritiesIndustryMember
Balance January 3, 2014 $ 2,402.9us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_SecuritiesIndustryMember