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Pension Plans - Summary of Amounts Included in Accumulated Other Comprehensive Income Loss (Detail) (USD $) In Millions, unless otherwise specified | Jan. 03, 2015 | Dec. 28, 2013
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Compensation and Retirement Disclosure [Abstract] |  |
Net loss, net of tax of $134.9 million and $96.5 million, respectively | $ (247.4)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax | $ (175.4)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax
Prior service credit, net of tax of $2.0 million and $2.3 million, respectively | 3.5 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax | 4.0 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax
Amounts included in accumulated other comprehensive income (loss) | $ (243.9)sna_PensionAndOtherPostretirementBenefitPlansAccumulatedOtherComprehensiveIncomeLossNetOfTax | $ (171.4)sna_PensionAndOtherPostretirementBenefitPlansAccumulatedOtherComprehensiveIncomeLossNetOfTax

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- Definition Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), net of tax + References No definition available. + Details
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Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
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- Details
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- Definition After tax net amount of gain (loss) that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases (decreases) in other comprehensive income as they arise. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant

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- Definition Amount after tax of cost (credit) due to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as a component of net periodic benefit cost. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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