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Accumulated Other Comprehensive Loss - Before and After Tax Amounts for Comprehensive Income (Loss) Components (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 29, 2020 | Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income/(loss) | $ (93,987) | $ 6,048
Foreign Currency Items |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income/(loss) before tax | (85,994) | (2,852)
Other comprehensive income/(loss), tax | (7,581) | 0
Other comprehensive income/(loss) | (93,575) | (2,852)
Defined benefit pension items |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income/(loss) before reclassifications before tax | 264 | (681)
Other comprehensive income/(loss) before reclassifications, tax | (67) | 173
Other comprehensive income/(loss) before reclassifications, net of tax | 197 | (508)
Other comprehensive income/(loss) before tax | 7,748 | 9,573
Other comprehensive income/(loss), tax | (1,968) | (2,417)
Other comprehensive income/(loss) | 5,780 | 7,156
Defined benefit pension items | Net Income |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Amounts reclassified from accumulated other comprehensive income/(loss) before tax | 7,484 | 10,254
Amounts reclassified from accumulated other comprehensive income/(loss), tax | (1,901) | (2,590)
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax | 5,583 | 7,664
Cash Flow Hedges |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income/(loss) before reclassifications before tax | (7,333) | 3,022
Other comprehensive income/(loss) before reclassifications, tax | 1,713 | (766)
Other comprehensive income/(loss) before reclassifications, net of tax | (5,620) | 2,256
Other comprehensive income/(loss) before tax | (5,943) | 2,513
Other comprehensive income/(loss), tax | 1,388 | (649)
Other comprehensive income/(loss) | (4,555) | 1,864
Cash Flow Hedges | Fixed Assets |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Amounts reclassified from accumulated other comprehensive income/(loss) before tax | 0 | (45)
Amounts reclassified from accumulated other comprehensive income/(loss), tax | 0 | 0
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax | 0 | (45)
Cash Flow Hedges | Net Income |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Amounts reclassified from accumulated other comprehensive income/(loss) before tax | 1,390 | (464)
Amounts reclassified from accumulated other comprehensive income/(loss), tax | (325) | 117
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax | 1,065 | (347)
Accumulated Other Comprehensive Loss |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income/(loss) before tax | (84,189) | 9,234
Other comprehensive income/(loss), tax | (8,161) | (3,066)
Other comprehensive income/(loss) | $ (92,350) | $ 6,168

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