XML 90 R78.htm IDEA: XBRL DOCUMENT v3.10.0.1

Commitments and Contingencies - Narrative (Detail) - USD ($) $ in Millions	Sep. 29, 2018	Dec. 30, 2017
Patent Related Litigation Matter
Loss Contingencies [Line Items]
Loss contingency accrual	$ 30.9	$ 30.9
Employment Related Litigation Matter
Loss Contingencies [Line Items]
Loss contingency accrual	$ 15.0	$ 15.0

X

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

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

+ Details

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

X

- Details

Name:	srt_LitigationCaseAxis=sna_JudgmentInPatentRelatedLitigationMatterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_LitigationCaseAxis=sna_JudgmentInEmploymentRelatedLitigationMatterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: