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Receivables - Schedule of Finance and Contract Receivables on Nonaccrual Status (Detail) - USD ($) $ in Millions	Sep. 28, 2019	Dec. 29, 2018
Receivables [Abstract]
Finance receivables	$ 12.5	$ 12.0
Contract receivables	$ 2.7	$ 5.8

X

- Definition

Contract receivable recorded investment nonaccrual status.

+ References

No definition available.

+ Details

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

X

- Definition

Notes and loans receivable recorded investment non-accrual status.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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