XML 53 R41.htm IDEA: XBRL DOCUMENT v3.7.0.1

Summary of Accounting Policies - Additional Information (Detail) - Unconsolidated Affiliates [Member] - USD ($)	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Dec. 31, 2016
Summary Of Accounting Policies [Line Items]
Investments in unconsolidated affiliates	$ 15,800,000		$ 15,200,000
Purchases from unconsolidated affiliates	3,000,000	$ 4,200,000
Sales to unconsolidated affiliates	$ 100,000	$ 0.0
Minimum [Member]
Summary Of Accounting Policies [Line Items]
Percentage of ownership interest under equity method accounting	20.00%
Maximum [Member]
Summary Of Accounting Policies [Line Items]
Percentage of ownership interest under equity method accounting	50.00%

X

- Definition

Purchases from unconsolidated affiliates.

+ References

No definition available.

+ Details

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

X

- Definition

Sales to unconsolidated affiliates.

+ References

No definition available.

+ Details

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

X

- Definition

Summary Of Accounting Policies [Line Items]

+ References

No definition available.

+ Details

Name:	sna_SummaryOfAccountingPoliciesLineItems
Namespace Prefix:	sna_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_EquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=sna_UnconsolidatedAffiliatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: