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Goodwill and Other Intangible Assets - Weighted-Average Amortization Period by Major Class (Detail) | 6 Months Ended
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Jul. 01, 2017
Finite-Lived Intangible Assets [Line Items] |
Weighted-average amortization period (in years) | 11 years
Customer relationships [Member] |
Finite-Lived Intangible Assets [Line Items] |
Weighted-average amortization period (in years) | 15 years
Internally developed software [Member] |
Finite-Lived Intangible Assets [Line Items] |
Weighted-average amortization period (in years) | 3 years
Patents [Member] |
Finite-Lived Intangible Assets [Line Items] |
Weighted-average amortization period (in years) | 8 years
Trademarks [Member] |
Finite-Lived Intangible Assets [Line Items] |
Weighted-average amortization period (in years) | 6 years
Other [Member] |
Finite-Lived Intangible Assets [Line Items] |
Weighted-average amortization period (in years) | 39 years

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_PatentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=sna_OtherFiniteLivedIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |