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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Commitments And Contingencies [Line Items] |  |  |
Rent expense, net of sub-lease rental income | $ 30.6 us-gaap_LeaseAndRentalExpense | $ 31.2 us-gaap_LeaseAndRentalExpense | $ 29.7 us-gaap_LeaseAndRentalExpense
Collective bargaining agreements expiration | 5 years |  |
Workforce Subject to Collective Bargaining Arrangements [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Number of employees covered under collective bargaining agreements | 2,600 sna_NumberOfEmployeesCoveredByCollectiveBargainingAgreements / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsMember |  |
Percentage of employees covered under collective bargaining agreements | 23.00%sna_PercentageOfEmployeesCoveredUnderCollectiveBargainingAgreements / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsMember |  |
Workforce Subject to Collective Bargaining Agreements Expiring in 2015 [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Number of employees covered under collective bargaining agreements | 1,250 sna_NumberOfEmployeesCoveredByCollectiveBargainingAgreements / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYearMember |  |
Collective bargaining agreements year of expiration | 2015 |  |
Workforce Subject to Collective Bargaining Arrangements Expiring in 2016 [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Number of employees covered under collective bargaining agreements | 400 sna_NumberOfEmployeesCoveredByCollectiveBargainingAgreements / us-gaap_ConcentrationRiskByBenchmarkAxis = sna_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinTwoYearMember |  |
Collective bargaining agreements year of expiration | 2016 |  |
Workforce Subject to Collective Bargaining Arrangements Expiring in 2017 [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Number of employees covered under collective bargaining agreements | 600 sna_NumberOfEmployeesCoveredByCollectiveBargainingAgreements / us-gaap_ConcentrationRiskByBenchmarkAxis = sna_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinThreeYearMember |  |
Collective bargaining agreements year of expiration | 2017 |  |
Workforce Subject to Collective Bargaining Arrangements Expiring in 2018 [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Number of employees covered under collective bargaining agreements | 0 sna_NumberOfEmployeesCoveredByCollectiveBargainingAgreements / us-gaap_ConcentrationRiskByBenchmarkAxis = sna_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinFourYearMember |  |
Collective bargaining agreements year of expiration | 2018 |  |
Workforce Subject to Collective Bargaining Arrangements Expiring in 2019 [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Number of employees covered under collective bargaining agreements | 0 sna_NumberOfEmployeesCoveredByCollectiveBargainingAgreements / us-gaap_ConcentrationRiskByBenchmarkAxis = sna_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinFiveYearMember |  |
Collective bargaining agreements year of expiration | 2019 |  |

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- Definition Collective bargaining agreements year of expiration + References No definition available. + Details
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- Details
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- Definition Number Of Employees Covered By Collective Bargaining Agreements + References No definition available. + Details
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- Definition Percentage of employees covered under collective bargaining agreements + References No definition available. + Details
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- Definition Term period of collective bargaining agreement. + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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