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v2.4.1.9

Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013
Goodwill [Line Items] |  |
Beginning Balance | $ 838.8 us-gaap_Goodwill | $ 807.4 us-gaap_Goodwill
Currency translation | (41.3)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments | 6.6 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
Acquisition | 13.2 us-gaap_GoodwillAcquiredDuringPeriod | 24.8 us-gaap_GoodwillAcquiredDuringPeriod
Ending Balance | 810.7 us-gaap_Goodwill | 838.8 us-gaap_Goodwill
Commercial & Industrial Group [Member] |  |
Goodwill [Line Items] |  |
Beginning Balance | 312.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sna_CommercialAndIndustrialGroupMember | 306.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sna_CommercialAndIndustrialGroupMember
Currency translation | (36.6)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = sna_CommercialAndIndustrialGroupMember | 5.6 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = sna_CommercialAndIndustrialGroupMember
Acquisition |  |
Ending Balance | 275.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sna_CommercialAndIndustrialGroupMember | 312.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sna_CommercialAndIndustrialGroupMember
Snap-on Tools Group [Member] |  |
Goodwill [Line Items] |  |
Beginning Balance | 12.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sna_ToolsGroupMember | 12.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sna_ToolsGroupMember
Currency translation |  |
Acquisition |  |
Ending Balance | 12.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sna_ToolsGroupMember | 12.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sna_ToolsGroupMember
Repair Systems & Information Group [Member] |  |
Goodwill [Line Items] |  |
Beginning Balance | 513.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sna_RepairSystemsAndInformationGroupMember | 488.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sna_RepairSystemsAndInformationGroupMember
Currency translation | (4.7)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = sna_RepairSystemsAndInformationGroupMember | 1.0 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = sna_RepairSystemsAndInformationGroupMember
Acquisition | 13.2 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = sna_RepairSystemsAndInformationGroupMember | 24.8 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = sna_RepairSystemsAndInformationGroupMember
Ending Balance | $ 522.3 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sna_RepairSystemsAndInformationGroupMember | $ 513.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = sna_RepairSystemsAndInformationGroupMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
Name: | us-gaap_StatementBusinessSegmentsAxis=sna_RepairSystemsAndInformationGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=sna_ToolsGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |