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Changes in Carrying Amount of Goodwill by Segment (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Apr. 04, 2015
Jan. 03, 2015
Goodwill [Line Items]    
Goodwill Beginning Balance $ 7,275.5us-gaap_Goodwill  
Foreign currency translation (149.0)us-gaap_GoodwillTranslationAdjustments  
Goodwill Ending Balance 7,126.5us-gaap_Goodwill  
Tools & Storage [Member]    
Goodwill [Line Items]    
Goodwill Beginning Balance 3,445.7us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_ToolsStorageMember
 
Foreign currency translation (61.2)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= swk_ToolsStorageMember
 
Goodwill Ending Balance 3,384.5us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_ToolsStorageMember
3,445.7us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_ToolsStorageMember
Goodwill transfer between segments   569.0us-gaap_GoodwillTransfers
/ us-gaap_StatementBusinessSegmentsAxis
= swk_ToolsStorageMember
Industrial Segment    
Goodwill [Line Items]    
Goodwill Beginning Balance 2,398.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_IndustrialSegmentMember
 
Foreign currency translation (70.7)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= swk_IndustrialSegmentMember
 
Goodwill Ending Balance 2,327.3us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_IndustrialSegmentMember
2,398.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_IndustrialSegmentMember
Goodwill transfer between segments   (564.1)us-gaap_GoodwillTransfers
/ us-gaap_StatementBusinessSegmentsAxis
= swk_IndustrialSegmentMember
Securities Industry    
Goodwill [Line Items]    
Goodwill Beginning Balance 1,431.8us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_SecuritiesIndustryMember
 
Foreign currency translation (17.1)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= swk_SecuritiesIndustryMember
 
Goodwill Ending Balance 1,414.7us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_SecuritiesIndustryMember
1,431.8us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_SecuritiesIndustryMember
Goodwill transfer between segments   $ (4.9)us-gaap_GoodwillTransfers
/ us-gaap_StatementBusinessSegmentsAxis
= swk_SecuritiesIndustryMember