Summary Of Significant Accounting Policies (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 27, 2016	Mar. 29, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, December 27, 2015	$ (40,227)
Other comprehensive income (loss) before reclassification	1,544
Amounts reclassified from other comprehensive income	344
Net other comprehensive income (loss)	1,888	$ (10,468)
Balance, March 27, 2016	(38,339)
Pension plan
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, December 27, 2015	(18,232)
Other comprehensive income (loss) before reclassification	(337)
Amounts reclassified from other comprehensive income	316
Net other comprehensive income (loss)	(21)
Balance, March 27, 2016	(18,253)
Other postretirement benefit plan
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, December 27, 2015	(1,014)
Other comprehensive income (loss) before reclassification	0
Amounts reclassified from other comprehensive income	28
Net other comprehensive income (loss)	28
Balance, March 27, 2016	(986)
Changes in realized and unrealized gains (losses) on derivative hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, December 27, 2015	(125)
Other comprehensive income (loss) before reclassification	(311)
Amounts reclassified from other comprehensive income	0
Net other comprehensive income (loss)	(311)
Balance, March 27, 2016	(436)
Foreign currency translation adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, December 27, 2015	(20,856)
Other comprehensive income (loss) before reclassification	2,192
Amounts reclassified from other comprehensive income	0
Net other comprehensive income (loss)	2,192
Balance, March 27, 2016	$ (18,664)

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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