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Inventories - Additional Information (Detail) (USD $) | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Geographic Valuation Methodologies Of Inventory [Line Items] |  |  |
Effect of LIFO inventory liquidation on income | $ 0 us-gaap_EffectOfLIFOInventoryLiquidationOnIncome | $ 0 us-gaap_EffectOfLIFOInventoryLiquidationOnIncome | $ 0 us-gaap_EffectOfLIFOInventoryLiquidationOnIncome
Foreign and US Countries [Member] |  |  |
Geographic Valuation Methodologies Of Inventory [Line Items] |  |  |
Percentage of FIFO Inventory | 58.00%us-gaap_PercentageOfFIFOInventory / us-gaap_StatementGeographicalAxis = sna_ForeignAndUsCountriesMember | 60.00%us-gaap_PercentageOfFIFOInventory / us-gaap_StatementGeographicalAxis = sna_ForeignAndUsCountriesMember |
United States [Member] |  |  |
Geographic Valuation Methodologies Of Inventory [Line Items] |  |  |
Percentage of FIFO Inventory | 31.00%us-gaap_PercentageOfFIFOInventory / us-gaap_StatementGeographicalAxis = country_US |  |
Percentage of LIFO Inventory | 69.00%us-gaap_PercentageOfLIFOInventory / us-gaap_StatementGeographicalAxis = country_US |  |

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- Definition The effect of liquidating LIFO (last in first out) inventory layers on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6b) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100079-122729 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6a) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386917&loc=d3e99609-122727 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6c) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SAB TOPIC 11.F) -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100079-122729 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 11 -Section F + Details
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