Other Comprehensive Earnings (Loss), Tax Effects on Changes in Other Comprehensive Earnings (loss) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 02, 2017	Jun. 26, 2016	Jul. 02, 2017	Jun. 26, 2016
Other Comprehensive Earnings (Loss) [Abstract]
Tax (expense) benefit on cash flow hedging activities	$ (1,074)	$ 4,747	$ 4,236	$ 8,003
Tax (expense) benefit on unrealized holding gains (losses)	(148)	185	(130)	(768)
Reclassification Adjustment from AOCE, Tax expense (benefit) on cash flow hedging activities	(640)	1,069	(1,009)	2,818
Reclassification Adjustment from AOCE, Tax benefit on amortization of unrecognized pension and postretirement amounts	(822)	(666)	(1,644)	(1,333)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Total	(2,684)	$ 5,335	$ 1,453	$ 8,720
Cash Flow Hedge gains to be Reclassified within Twelve Months	$ 8,476

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580

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Amount of tax (expense) benefit of reclassification adjustment from accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity.

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Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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