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Pension Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 29, 2013
Foreign Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected future employer contributions	$ 10.2
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected future employer contributions	1.6
Discretionary cash contribution by employer	15.0
Cash contributed by employer	15.7
Contribution required by law	$ 0.7

X

- Definition

Defined benefit plan contributions by employer, optional cash contributions.

+ References

No definition available.

+ Details

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Namespace Prefix:	sna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Defined benefit plan contributions by employer, required by law.

+ References

No definition available.

+ Details

Name:	sna_DefinedBenefitPlanContributionsByEmployerRequiredByLaw
Namespace Prefix:	sna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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- Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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