(Accumulated Other Comprehensive Income (Loss) Rollforward) (Details) $ in Thousands	6 Months Ended
Jun. 30, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss), Tax [Roll Forward]
Balance at December 30, 2017, tax	$ 243,760
Amounts reclassified from accumulated other comprehensive loss, tax	(3,659)
Current-period other comprehensive income (loss) activity, tax	(7,420)
Balance at June 30, 2018, tax	232,681
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 30, 2017, net of tax	(439,206)
Amounts reclassified from accumulated other comprehensive loss, net of tax	11,575
Current-period other comprehensive income (loss) activity, net of tax	(44,923)
Balance at June 30, 2018, net of tax	(472,554)
Cumulative translation adjustment
Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward]
Balance at December 30, 2017, before tax	(43,505)
Amounts reclassified from accumulated other comprehensive loss, before tax	0
Current-period other comprehensive income (loss) activity, before tax	(62,777)
Balance at June 30, 2018, before tax	(106,282)
Hedges
Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward]
Balance at December 30, 2017, before tax	(25,461)
Amounts reclassified from accumulated other comprehensive loss, before tax	7,219
Current-period other comprehensive income (loss) activity, before tax	25,274
Balance at June 30, 2018, before tax	7,032
Defined benefit plans
Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward]
Balance at December 30, 2017, before tax	(614,000)
Amounts reclassified from accumulated other comprehensive loss, before tax	8,015
Current-period other comprehensive income (loss) activity, before tax	0
Balance at June 30, 2018, before tax	$ (605,985)

Accumulated Other Comprehensive Income (Loss), Tax

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Accumulated Other Comprehensive Income (Loss), Tax [Roll Forward]

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Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]

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Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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