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Pension Plans - Summary of Amounts in Accumulated OCI to be Amortized Over Next Fiscal Year (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Jan. 03, 2015
Compensation and Retirement Disclosure [Abstract] |
Amortization of unrecognized loss | $ 35.7 sna_DefinedBenefitPlanFutureAmortizationOfUnrecognizedGainLoss
Amortization of prior service credit | (0.9)us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit
Total to be recognized in net periodic benefit cost | $ 34.8 us-gaap_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear

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- Definition Defined Benefit Plan Future Amortization Of Unrecognized Gain Loss + References No definition available. + Details
Name: | sna_DefinedBenefitPlanFutureAmortizationOfUnrecognizedGainLoss
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration