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Property and Equipment - Schedule of Property and Equipment (Detail) (USD $) In Millions, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013
Property, Plant and Equipment [Abstract]
Land	$ 18.3us-gaap_Land	$ 19.6us-gaap_Land
Buildings and improvements	294.0us-gaap_BuildingsAndImprovementsGross	292.0us-gaap_BuildingsAndImprovementsGross
Machinery, equipment and computer software	750.8sna_MachineryEquipmentAndComputerSoftware	725.4sna_MachineryEquipmentAndComputerSoftware
Property and equipment - gross	1,063.1us-gaap_PropertyPlantAndEquipmentGross	1,037.0us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization	(658.6)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	(644.5)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment - net	$ 404.5us-gaap_PropertyPlantAndEquipmentNet	$ 392.5us-gaap_PropertyPlantAndEquipmentNet

X

- Definition

Machinery, equipment and computer software

+ References

No definition available.

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.14)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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- Definition

Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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