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Receivables - Schedule of Finance and Contract Receivables on Nonaccrual Status (Detail) (USD $)
In Millions, unless otherwise specified
Jan. 03, 2015
Dec. 28, 2013
Receivables [Abstract]    
Finance receivables $ 7.9sna_NotesAndLoansReceivableRecordedInvestmentNonAccrualStatus $ 8.3sna_NotesAndLoansReceivableRecordedInvestmentNonAccrualStatus
Contract receivables $ 1.5sna_ContractReceivableRecordedInvestmentNonaccrualStatus $ 1.0sna_ContractReceivableRecordedInvestmentNonaccrualStatus