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Postretirement Plans (Summary of Amounts Included In Accumulated Other Comprehensive Income On Accompanying Consolidated Balance Sheets As Of Year End 2012 And 2011) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 29, 2012 | Dec. 31, 2011
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Defined Benefit Plan Disclosure [Line Items] |  |
Net gain (loss), net of tax | $ (260.4) | $ (268.0)
U.S. Postretirement Health Care Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net gain (loss), net of tax | $ 0.8 | $ (0.4)

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- Definition Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), net gains (losses), net of tax + References No definition available. + Details
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Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration