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Receivables - Components of Finance and Contract Receivables Beyond One Year (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Apr. 04, 2015
Jan. 03, 2015
Receivables [Abstract]    
Unearned finance charges, finance receivables $ 9.7sna_DeferredDiscountsFinanceChargesAndInterestIncludedInNotesAndLoansReceivableNonCurrent $ 9.9sna_DeferredDiscountsFinanceChargesAndInterestIncludedInNotesAndLoansReceivableNonCurrent
Unearned finance charges, contract receivable $ 19.7sna_DeferredDiscountsFinanceChargesAndInterestIncludedInContractReceivablesNonCurrent $ 19.4sna_DeferredDiscountsFinanceChargesAndInterestIncludedInContractReceivablesNonCurrent