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Subsequent Event - Additional Information (Detail) - Subsequent Event [Member] - Car-O-Liner Holding AB [Member] $ in Millions	Oct. 17, 2016 USD ($)
Subsequent Event [Line Items]
Preliminary cash purchase price of acquisition	$ 155
Trailing twelve month revenue period of acquired entity	12 months
Trailing twelve month revenue of acquired entity	$ 95
Business acquisition scheduled closing period	30 days

X

- Definition

Business acquisition scheduled closing period.

+ References

No definition available.

+ Details

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Namespace Prefix:	sna_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Trailing twelve month revenue of acquired entity.

+ References

No definition available.

+ Details

Name:	sna_TrailingTwelveMonthRevenueOfAcquiredEntity
Namespace Prefix:	sna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Trailing twelve month revenue period of acquired entity.

+ References

No definition available.

+ Details

Name:	sna_TrailingTwelveMonthRevenuePeriodOfAcquiredEntity
Namespace Prefix:	sna_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=sna_CarOLinerHoldingABMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: