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Receivables - Rollforward of Combined Allowances for Doubtful Accounts Related to Trade and Other Accounts Receivable (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |
Balance at Beginning of Year | $ 75.7 | $ 66.5 | $ 59.3
Expenses | 70.3 | 65.1 | 51.5
Deductions | (62.8) | (55.9) | (44.3)
Balance at End of Year | $ 83.2 | $ 75.7 | $ 66.5

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- 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

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- Definition Accounts, Notes loans, and Contract Receivable allowance for credit losses provision. + References No definition available. + Details
Name: | sna_AccountsNotesLoansAndContractReceivableAllowanceForCreditLossesProvision
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Accounts, Notes loans, and Contract Receivable allowance for credit losses write-offs net of recoveries. + References No definition available. + Details
Name: | sna_AccountsNotesLoansAndContractReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration