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Basis of presentation - additional information (Detail) (Reclassifications, USD $) In Millions, unless otherwise specified | 9 Months Ended
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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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- 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 + Details
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