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Receivables - Schedule of Finance and Contract Receivables on Nonaccrual Status (Detail) (USD $)
In Millions, unless otherwise specified
Apr. 04, 2015
Jan. 03, 2015
Receivables [Abstract]    
Finance receivables $ 8.3sna_NotesAndLoansReceivableRecordedInvestmentNonAccrualStatus $ 7.9sna_NotesAndLoansReceivableRecordedInvestmentNonAccrualStatus
Contract receivables $ 1.8sna_ContractReceivableRecordedInvestmentNonaccrualStatus $ 1.5sna_ContractReceivableRecordedInvestmentNonaccrualStatus