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Short-term and Long-term Debt - Short-term and Long-term Debt (Parenthetical) (Detail)	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013
5.85% Unsecured Notes Due March 2014 [Member]
Schedule Of Debt Instruments [Line Items]
Unsecured notes, interest rate		5.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sna_FivePointEightFivePercentageUnsecuredNotesDueMarchTwoThousandFourteenMember
Unsecured notes, maturity Month and year	2014-03	2014-03
5.50% Unsecured Notes Due 2017 [Member]
Schedule Of Debt Instruments [Line Items]
Unsecured notes, interest rate	5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sna_FivePointFiveZeroPercentageUnsecuredNotesDueTwoThousandSeventeenMember	5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sna_FivePointFiveZeroPercentageUnsecuredNotesDueTwoThousandSeventeenMember
Unsecured notes, maturity year	2017	2017
4.25% Unsecured Notes Due 2018 [Member]
Schedule Of Debt Instruments [Line Items]
Unsecured notes, interest rate	4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sna_FourPointTwoFivePercentageUnsecuredNotesDueTwoThousandEighteenMember	4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sna_FourPointTwoFivePercentageUnsecuredNotesDueTwoThousandEighteenMember
Unsecured notes, maturity year	2018	2018
6.70% Unsecured Notes Due 2019 [Member]
Schedule Of Debt Instruments [Line Items]
Unsecured notes, interest rate	6.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sna_SixPointSevenZeroPercentageUnsecuredNotesDueTwoThousandNineteenMember	6.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sna_SixPointSevenZeroPercentageUnsecuredNotesDueTwoThousandNineteenMember
Unsecured notes, maturity year	2019	2019
6.125% Unsecured Notes Due 2021 [Member]
Schedule Of Debt Instruments [Line Items]
Unsecured notes, interest rate	6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sna_SixPointOneTwoFivePercentageUnsecuredNotesDueTwoThousandTwentyOneMember	6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sna_SixPointOneTwoFivePercentageUnsecuredNotesDueTwoThousandTwentyOneMember
Unsecured notes, maturity year	2021	2021

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+ References

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- Definition

Debt instruments maturity month year.

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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