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Property and Equipment - Summary of Estimated Service Lives of Property and Equipment (Detail) | 12 Months Ended
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Dec. 29, 2018
Minimum | Buildings and improvements |
Property, Plant and Equipment [Line Items] |
Estimate life, years | 3 years
Minimum | Machinery, equipment and computer software |
Property, Plant and Equipment [Line Items] |
Estimate life, years | 2 years
Maximum | Buildings and improvements |
Property, Plant and Equipment [Line Items] |
Estimate life, years | 50 years
Maximum | Machinery, equipment and computer software |
Property, Plant and Equipment [Line Items] |
Estimate life, years | 15 years

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- Definition Estimated service lives of property and equipment. + References No definition available. + Details
Name: | sna_EstimatedServiceLivesOfPropertyAndEquipment
Namespace Prefix: | sna_
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_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=sna_MachineryEquipmentAndComputerSoftwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |