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Commitments and Contingencies - Components of Capital Leases Future Minimum Payment Present Value (Detail) (USD $)
In Millions, unless otherwise specified
Jan. 03, 2015
Commitments and Contingencies Disclosure [Abstract]  
Other accrued liabilities $ 5.7sna_OtherAccruedLiabilitiesCapitalLeasePayments
Other long-term liabilities 20.1sna_OtherLongTermLiabilitiesCapitalLeasePayments
Total present value of minimum capital lease payments $ 25.8us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments