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Receivables (Rollforward Of The Combined Allowances For Doubtful Accounts Related To Trade And Other Accounts Receivable) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Allowance For Doubtful Accounts Receivable [Line Items]
Balance at Beginning of Year	$ 50.3	$ 52.5	$ 40.6
Expenses	31.3	26.2	34.4
Deductions	(32.9)	(28.4)	(22.5)
Balance at End of Year	$ 48.7	$ 50.3	$ 52.5

X

- Definition

Accounts notes, loans and contract receivable allowance for credit losses.

+ References

No definition available.

+ Details

Name:	sna_AccountsNotesLoansAndContractReceivableAllowanceForCreditLosses
Namespace Prefix:	sna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Accounts notes, loans and contract receivable allowance for credit losses recoveries.

+ References

No definition available.

+ Details

Name:	sna_AccountsNotesLoansAndContractReceivableAllowanceForCreditLossesRecoveries
Namespace Prefix:	sna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Accounts notes, loans and contract receivable allowance for credit losses write offs.

+ References

No definition available.

+ Details

Name:	sna_AccountsNotesLoansAndContractReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix:	sna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	sna_AllowanceForDoubtfulAccountsReceivableLineItems
Namespace Prefix:	sna_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration