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Commitments and Contingencies - Components of Capital Leases Future Minimum Payment Present Value (Detail) $ in Millions	Dec. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Other accrued liabilities	$ 3.2
Other long-term liabilities	13.7
Total present value of minimum capital lease payments	$ 16.9

X

- Definition

Other accrued liabilities capital lease payments.

+ References

No definition available.

+ Details

Name:	sna_OtherAccruedLiabilitiesCapitalLeasePayments
Namespace Prefix:	sna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Other long-term liabilities capital lease payments.

+ References

No definition available.

+ Details

Name:	sna_OtherLongTermLiabilitiesCapitalLeasePayments
Namespace Prefix:	sna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737

+ Details

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

X

- References

No definition available.

+ Details

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