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Financial instruments - Foreign exchange gains and losses recognized within AOCI and the interest benefit recognized within interest expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 27, 2021 | Jun. 28, 2020 | Jun. 27, 2021 | Jun. 28, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Foreign exchange (losses) gains | $ 6,080 | $ 17,654 | $ (17,995) | $ (545)
Interest benefit |  |  | 9,126 | 9,805
Cross-currency interest rate swaps | Cash flow hedging |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Foreign exchange (losses) gains | (7,127) | (7,408) | 10,487 | 17,607
Cross-currency interest rate swaps | Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest benefit | $ 4,479 | $ 4,931 | $ 9,126 | $ 9,805

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