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Exit and Disposal Activities - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jan. 03, 2015
Employees
Dec. 28, 2013
Dec. 29, 2012
Restructuring and Related Activities [Abstract]      
Restructuring costs incurred $ 6.5us-gaap_RestructuringAndRelatedCostIncurredCost $ 6.4us-gaap_RestructuringAndRelatedCostIncurredCost  
Accrued restructuring costs 6.5us-gaap_RestructuringCharges 6.0us-gaap_RestructuringCharges  
Number of employees 80sna_ReducedHeadcountFromRestructuringActions    
Expected exit and disposal cost 6.5us-gaap_RestructuringReserve 4.0us-gaap_RestructuringReserve 7.2us-gaap_RestructuringReserve
Expected exit and disposal cost, future period $ 6.5sna_RestructuringAndRelatedCostExpectedCostForRemainderOfFiscalYear