Accumulated Other Comprehensive Income (Loss) [Roll Forward]

No definition available.

Name:	swk_AccumulatedOtherComprehensiveIncomeLossRollForward
Namespace Prefix:	swk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581

+ Details

Name:	us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580

+ Details

Name:	us-gaap_OtherComprehensiveIncomeLossNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 17B
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL34724394-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581

+ Details

Name:	us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4I
-URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4590271-111686

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683

+ Details

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

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedTranslationAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedOtherComprehensiveIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

ACCUMULATED OTHER COMPREHENSIVE LOSS - Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Sep. 26, 2020	Sep. 28, 2019
Accumulated other comprehensive (loss):
Beginning balance	$ 9,965.6	$ 8,959.2	$ 9,142.2	$ 8,233.3	$ 7,936.7	$ 7,839.9	$ 9,142.2	$ 7,839.9
Other comprehensive (loss) income before reclassifications							(98.4)	(122.2)
Reclassification adjustments to earnings							21.9	(8.4)
Net other comprehensive (loss) income	79.5	102.8	(258.8)	(130.9)	(0.7)	1.0	(76.5)	(130.6)
Ending balance	10,379.3	9,965.6	8,959.2	8,268.2	8,233.3	7,936.7	10,379.3	8,268.2
Currency translation adjustment and other
Accumulated other comprehensive (loss):
Beginning balance			(1,517.2)			(1,481.2)	(1,517.2)	(1,481.2)
Other comprehensive (loss) income before reclassifications							(29.2)	(182.4)
Reclassification adjustments to earnings							0.0	0.0
Net other comprehensive (loss) income							(29.2)	(182.4)
Ending balance	(1,546.4)			(1,663.6)			(1,546.4)	(1,663.6)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated other comprehensive (loss):
Beginning balance			(54.2)			(26.8)	(54.2)	(26.8)
Other comprehensive (loss) income before reclassifications							(61.7)	(29.9)
Reclassification adjustments to earnings							0.6	2.2
Net other comprehensive (loss) income							(61.1)	(27.7)
Ending balance	(115.3)			(54.5)			(115.3)	(54.5)
Unrealized gains (losses) on net investment hedges, net of tax
Accumulated other comprehensive (loss):
Beginning balance			97.3			63.3	97.3	63.3
Other comprehensive (loss) income before reclassifications							(10.5)	83.5
Reclassification adjustments to earnings							10.4	(19.3)
Net other comprehensive (loss) income							(0.1)	64.2
Ending balance	97.2			127.5			97.2	127.5
Pension (losses) gains, net of tax
Accumulated other comprehensive (loss):
Beginning balance			(410.5)			(369.6)	(410.5)	(369.6)
Other comprehensive (loss) income before reclassifications							3.0	6.6
Reclassification adjustments to earnings							10.9	8.7
Net other comprehensive (loss) income							13.9	15.3
Ending balance	(396.6)			(354.3)			(396.6)	(354.3)
Accumulated Other Comprehensive Loss
Accumulated other comprehensive (loss):
Beginning balance	(2,040.6)	(2,143.4)	(1,884.6)	(1,814.0)	(1,813.3)	(1,814.3)	(1,884.6)	(1,814.3)
Net other comprehensive (loss) income	79.5	102.8	(258.8)	(130.9)	(0.7)	1.0
Ending balance	$ (1,961.1)	$ (2,040.6)	$ (2,143.4)	$ (1,944.9)	$ (1,814.0)	$ (1,813.3)	$ (1,961.1)	$ (1,944.9)