XML 102 R103.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Pension Plans (Summary Of Changes In Fair Value Of Foreign Plan Assets With Level 3 Inputs) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 29, 2012 | Dec. 31, 2011
Domestic Pension Plans [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Beginning balance | $ 152.4 | $ 144.6
Realized gains (losses) on assets sold | 5.2 | 4.0
Unrealized gains (losses) attributable to assets held | 3.3 | 2.6
Net purchases and settlements | 2.7 | 1.2
Ending balance | 163.6 | 152.4
Hedge Fund Interests [Member] | Domestic Pension Plans [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Beginning balance | 68.6 | 73.5
Realized gains (losses) on assets sold | 1.0 | 0.5
Unrealized gains (losses) attributable to assets held | 5.0 | (1.8)
Net purchases and settlements | 0.4 | (3.6)
Ending balance | 75.0 | 68.6
Hedge Fund Interests [Member] | Foreign Pension Plans [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Beginning balance | 16.5 | 16.2
Unrealized gains (losses) attributable to assets held | 2.0 | 0.3
Net purchases and settlements | 1.5 |
Ending balance | 20.0 | 16.5
Private Equity Partnership Interests [Member] | Domestic Pension Plans [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Beginning balance | 49.9 | 41.4
Realized gains (losses) on assets sold | 4.0 | 3.3
Unrealized gains (losses) attributable to assets held | (5.1) | 1.0
Net purchases and settlements | 0.8 | 4.2
Ending balance | 49.6 | 49.9
Real Estate Interests [Member] | Domestic Pension Plans [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Beginning balance | 33.9 | 29.7
Realized gains (losses) on assets sold | 0.2 | 0.2
Unrealized gains (losses) attributable to assets held | 3.4 | 3.4
Net purchases and settlements | 1.5 | 0.6
Ending balance | $ 39.0 | $ 33.9

X
- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Unrealized Gains (Losses) Attributable To Assets Held + References No definition available. + Details
Name: | sna_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainsLossesAttributableToAssetsHeld
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | sna_PensionPlansPostretirementAndOtherEmployeeBenefitsLineItems
Namespace Prefix: | sna_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of purchases, sales, issues, and settlements (net) which have taken place in relation to assets measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant