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Financial instruments - After tax gains and losses reclassified from accumulated other comprehensive income into income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 25, 2016 | Sep. 27, 2015 | Sep. 25, 2016 | Sep. 27, 2015
Forward Contracts | Cash flow hedging | Foreign Currency Contract |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
After Tax Gain (Loss) Recognized in OCI | $ (223) | $ (730) | $ 761 | $ (1,489)

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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. + Details
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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=56946850&loc=SL5624171-113959 + Details
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