Summary of Fair Value of Derivatives (Detail) - USD ($) $ in Millions	Jul. 02, 2016	Jan. 02, 2016
Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Interest Rate Derivatives	$ 0.0	$ 950.0
Net Investment Hedging \| Foreign Exchange Contracts
Derivatives, Fair Value [Line Items]
Notional Amount of Interest Rate Derivatives	1,400.0
Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives	108.5	72.2
Fair value of liability derivatives	121.8	55.4
Designated as Hedging Instruments \| Cash Flow Hedges \| Interest Rate Contracts \| LT other assets
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives	0.0	0.0
Designated as Hedging Instruments \| Cash Flow Hedges \| Interest Rate Contracts \| LT other liabilities
Derivatives, Fair Value [Line Items]
Fair value of liability derivatives	95.1	41.1
Designated as Hedging Instruments \| Cash Flow Hedges \| Foreign Exchange Contracts \| Other current assets
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives	11.6	21.9
Designated as Hedging Instruments \| Cash Flow Hedges \| Foreign Exchange Contracts \| LT other assets
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives	4.6	3.7
Designated as Hedging Instruments \| Cash Flow Hedges \| Foreign Exchange Contracts \| Accrued expenses
Derivatives, Fair Value [Line Items]
Fair value of liability derivatives	4.3	1.8
Designated as Hedging Instruments \| Cash Flow Hedges \| Foreign Exchange Contracts \| LT other liabilities
Derivatives, Fair Value [Line Items]
Fair value of liability derivatives	0.4	0.0
Designated as Hedging Instruments \| Fair Value Hedging [Member] \| Interest Rate Contracts \| Other current assets
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives	0.0	14.9
Designated as Hedging Instruments \| Fair Value Hedging [Member] \| Interest Rate Contracts \| LT other assets
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives	0.0	1.4
Designated as Hedging Instruments \| Fair Value Hedging [Member] \| Interest Rate Contracts \| Accrued expenses
Derivatives, Fair Value [Line Items]
Fair value of liability derivatives	0.0	2.5
Designated as Hedging Instruments \| Fair Value Hedging [Member] \| Interest Rate Contracts \| LT other liabilities
Derivatives, Fair Value [Line Items]
Fair value of liability derivatives	0.0	5.2
Designated as Hedging Instruments \| Net Investment Hedging \| Other current assets
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives	92.3	30.3
Designated as Hedging Instruments \| Net Investment Hedging \| LT other assets
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives		0.0
Designated as Hedging Instruments \| Net Investment Hedging \| Accrued expenses
Derivatives, Fair Value [Line Items]
Fair value of liability derivatives	1.5	4.8
Designated as Hedging Instruments \| Net Investment Hedging \| LT other liabilities
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives	0.0
Fair value of liability derivatives	20.5	0.0
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives	37.3	7.1
Fair value of liability derivatives	85.2	40.7
Not Designated as Hedging Instrument \| Foreign Exchange Contracts \| Other current assets
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives	37.3	7.1
Not Designated as Hedging Instrument \| Foreign Exchange Contracts \| Accrued expenses
Derivatives, Fair Value [Line Items]
Fair value of liability derivatives	$ 85.2	$ 40.7

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719

+ Details

Name:	us-gaap_DerivativeFairValueOfDerivativeAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

+ Details

Name:	us-gaap_DerivativeFairValueOfDerivativeLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativesFairValueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_FairValueHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_NetInvestmentHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=swk_OtherLongLivedAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_AccruedLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: