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Segment Information and Geographic Area Information - Narrative (Details) $ in Millions	12 Months Ended
	May. 02, 2015 USD ($) segment	May. 03, 2014 USD ($)	Apr. 27, 2013 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	4
Goodwill impairment charge	$ 11.1	$ 0.0	$ 4.3
Litigation settlement amount			20.0
Interface
Segment Reporting Information [Line Items]
Goodwill impairment charge	$ 11.1	$ 0.0	$ 0.0

X

- Definition

Amount of loss from the write-down of an asset representing the 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 2



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 45



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 28



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (e)



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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X

- Definition

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

+ References

No definition available.

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X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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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.

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