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Financial instruments After tax (gain)/loss reclassified from accumulated other comprehensive income into income (Details) (Cash Flow Hedging, USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 28, 2014 | Sep. 29, 2013 | Sep. 28, 2014 | Sep. 29, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives qualifying as hedges, net of tax | $ 60 | $ (40) | $ 203 | $ (52)
Foreign Currency Forward Contract |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives qualifying as hedges, net of tax | $ 60 | $ (40) | $ 203 | $ (52)

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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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