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Acquisitions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 0 Months Ended
Jan. 03, 2015
Dec. 28, 2013
May 28, 2014
May 13, 2013
Business Acquisition [Line Items]        
Cash purchase price of acquisition $ 41.3us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 38.2us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired    
Pro-Cut International, Inc [Member]        
Business Acquisition [Line Items]        
Cash purchase price of acquisition     41.3us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= sna_ProCutInternationalIncMember		  
Challenger Lifts Inc [Member]        
Business Acquisition [Line Items]        
Cash purchase price of acquisition       $ 38.2us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= sna_ChallengerLiftsIncMember