CAPITAL STOCK - Additional Information, Long-Term Performance Awards (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award performance period	3 years
Earnings per share and return on capital employed as percentage of share based payment	75.00%
Market based element as percentage of share based payment	25.00%
Long term performance awards, grant year	2020	2019	2018
Share-based Compensation	$ 78.7	$ 81.2	$ 67.9
Long-Term Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation	$ 18.0	$ 20.0	$ 13.8

Earnings per Share and Return on Capital Employed as Percentage of Share Based Payment

No definition available.

Name:	swk_EarningsPerShareAndReturnOnCapitalEmployedAsPercentageOfShareBasedPayment
Namespace Prefix:	swk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Market Based Elements as Percentage of Share Based Payment

+ References

No definition available.

+ Details

Name:	swk_MarketBasedElementsAsPercentageOfShareBasedPayment
Namespace Prefix:	swk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Grant Year

+ References

No definition available.

+ Details

Name:	swk_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantYear
Namespace Prefix:	swk_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

+ Details

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

- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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

- Details

Name:	us-gaap_AwardTypeAxis=swk_PerformanceBasedAwardsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: