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Changes in Carrying Amount of Product and Service Warranties (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018
Disclosure Changes In Carrying Amount Of Product And Service Warranties [Abstract]
Balance beginning of period	$ 102.1	$ 108.5
Warranties and guarantees issued	92.7	81.7
Warranty payments and currency	(97.7)	(86.0)
Balance end of period	$ 97.1	$ 104.2

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- Definition

Disclosure - Changes in Carrying Amount of Product and Service Warranties [Abstract]

+ References

No definition available.

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Namespace Prefix:	swk_
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Balance Type:	na
Period Type:	duration

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- Definition

Product Warranty Accrual, Payments and Currency Translation

+ References

No definition available.

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Namespace Prefix:	swk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(5)
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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Balance Type:	credit
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- Definition

Amount of increase in the standard and extended product warranty accrual from warranties issued.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph ((c)(3))
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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