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Inventories - Additional Information (Detail) (USD $)	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014	Jan. 03, 2015
Geographic Valuation Methodologies Of Inventory [Line Items]
Effect of LIFO inventory liquidation on income	$ 0us-gaap_EffectOfLIFOInventoryLiquidationOnIncome	$ 0us-gaap_EffectOfLIFOInventoryLiquidationOnIncome
Foreign and US Countries [Member]
Geographic Valuation Methodologies Of Inventory [Line Items]
Percentage of FIFO Inventory	57.00%us-gaap_PercentageOfFIFOInventory / us-gaap_StatementGeographicalAxis = sna_ForeignAndUsCountriesMember		58.00%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

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-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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- Definition

The percentage of FIFO (first in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

+ References

No definition available.

+ Details

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- Definition

The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

+ References

No definition available.

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