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Short-term and Long-term Debt - Short-term and Long-term Debt (Detail) (USD $) In Millions, unless otherwise specified	Apr. 04, 2015	Jan. 03, 2015
Schedule Of Debt Instruments [Line Items]
Other debt	$ 93.2sna_OtherShortTermAndLongTermDebt	$ 69.3sna_OtherShortTermAndLongTermDebt
Long-term debt including current maturities	943.2us-gaap_LongTermDebt	919.3us-gaap_LongTermDebt
Less: notes payable	(78.8)us-gaap_NotesPayableCurrent	(56.6)us-gaap_NotesPayableCurrent
Total long-term debt	864.4us-gaap_LongTermDebtNoncurrent	862.7us-gaap_LongTermDebtNoncurrent
Long-term debt including current maturities	943.2us-gaap_LongTermDebt	919.3us-gaap_LongTermDebt
5.50% Unsecured Notes Due 2017 [Member]
Schedule Of Debt Instruments [Line Items]
Unsecured notes	150.0us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = sna_FivePointFiveZeroPercentageUnsecuredNotesDueTwoThousandSeventeenMember	150.0us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = sna_FivePointFiveZeroPercentageUnsecuredNotesDueTwoThousandSeventeenMember
4.25% Unsecured Notes Due 2018 [Member]
Schedule Of Debt Instruments [Line Items]
Unsecured notes	250.0us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = sna_FourPointTwoFivePercentageUnsecuredNotesDueTwoThousandEighteenMember	250.0us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = sna_FourPointTwoFivePercentageUnsecuredNotesDueTwoThousandEighteenMember
6.70% Unsecured Notes Due 2019 [Member]
Schedule Of Debt Instruments [Line Items]
Unsecured notes	200.0us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = sna_SixPointSevenZeroPercentageUnsecuredNotesDueTwoThousandNineteenMember	200.0us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = sna_SixPointSevenZeroPercentageUnsecuredNotesDueTwoThousandNineteenMember
6.125% Unsecured Notes Due 2021 [Member]
Schedule Of Debt Instruments [Line Items]
Unsecured notes	$ 250.0us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = sna_SixPointOneTwoFivePercentageUnsecuredNotesDueTwoThousandTwentyOneMember	$ 250.0us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = sna_SixPointOneTwoFivePercentageUnsecuredNotesDueTwoThousandTwentyOneMember

X

- Definition

Includes both short term and long term debt.

+ References

No definition available.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Publisher SEC

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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X

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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-Publisher FASB

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- Definition

Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.

+ References

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-Publisher FASB

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- Definition

Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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