XML 21 R107.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Postretirement Plans - Narratve (Detail) | 12 Months Ended
--- | ---
Dec. 28, 2019
Defined Benefit Plan Disclosure [Line Items] |
Health care cost trend rate, pre-65 | 5.60%
Health care cost trend rate, post-65 | 6.10%
U.S. Postretirement Health Care Plans |
Defined Benefit Plan Disclosure [Line Items] |
Health care cost trend rate, 2039 and thereafter | 4.50%
Expected long-term rate of return on plan assets | 5.40%

X
- Definition Defined Benefit Plan, Post-Sixty-Five Health Care Cost Trend Rate Assumed, Next Fiscal Year + References No definition available. + Details
Name: | sna_DefinedBenefitPlanPostSixtyFiveHealthCareCostTrendRateAssumedNextFiscalYear
Namespace Prefix: | sna_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Defined Benefit Plan, Pre-Sixty-Five Health Care Cost Trend Rate Assumed, Next Fiscal Year + References No definition available. + Details
Name: | sna_DefinedBenefitPlanPreSixtyFiveHealthCareCostTrendRateAssumedNextFiscalYear
Namespace Prefix: | sna_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Ultimate trend rate for health care cost for defined benefit postretirement plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_DefinedBenefitPostretirementHealthCoverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |