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Receivables (Schedule Of Performing And Nonperforming Finance And Contract Receivables) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Finance Receivables	$ 844.2	$ 733.2
Contract Receivables	260.3	218.9
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance Receivables	830.8	721.7
Contract Receivables	259.4	218.2
Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance Receivables	13.4	11.5
Contract Receivables	$ 0.9	$ 0.7

X

- Definition

Contract Receivable Total

+ References

No definition available.

+ Details

Name:	sna_ContractReceivableTotal
Namespace Prefix:	sna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Notes And Loans Receivable Total

+ References

No definition available.

+ Details

Name:	sna_NotesAndLoansReceivableTotal
Namespace Prefix:	sna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration