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Basis of presentation - additional information (Detail) (Reclassifications, USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 29, 2013
Reclassifications
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]
Tax withholding obligations for share based compensation	$ 2.5

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- Details

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- Definition

Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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