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Acquisitions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Jan. 03, 2015
Business Acquisition [Line Items]      
Assets Held-for-sale, Current $ 24.9us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent   $ 29.5us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Goodwill 7,126.5us-gaap_Goodwill   7,275.5us-gaap_Goodwill
Purchase price for acquisitions 0.4us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 3.2us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired  
Inventories, net 1,742.2us-gaap_InventoryNet   1,562.7us-gaap_InventoryNet
Industrial Segment      
Business Acquisition [Line Items]      
Goodwill $ 2,327.3us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_IndustrialSegmentMember
  $ 2,398.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= swk_IndustrialSegmentMember