Other Comprehensive Income - Summary of Components of Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 29, 2015	Mar. 30, 2014
Foreign currency transaction loss
Foreign currency transaction loss	$ 1,688
Changes in AOCI, Net
Total accumulated other comprehensive (loss) income, beginning of period	(104,233)	(81,897)
Gain (Loss) recognized in OCI, Net	(50)	1,085
Gain (Loss) reclassified from AOCI to income, Net	118	73
Total accumulated other comprehensive (loss) income, end of period	(104,165)	(80,739)
Changes in fair market value of hedges
Changes in AOCI, Gross
Gross, beginning of the period	(1,020)	(998)
Gain (Loss) recognized in OCI, Gross	(327)	(54)
Gain (Loss) reclassified from AOCI to income, Gross	190	118
Gross, end of the period	(1,157)	(934)
Changes in AOCI, Income tax (benefit)
Income tax (benefit), beginning of period	(384)	(402)
Income tax (benefit), Gain (Loss) recognized in OCI	(123)	(21)
Income tax (benefit), Gain (Loss) reclassified from AOCI to income	72	45
Income tax (benefit), end of period	(435)	(378)
Changes in AOCI, Net
Total accumulated other comprehensive (loss) income, beginning of period	(636)	(596)
Gain (Loss) recognized in OCI, Net	(204)	(33)
Gain (Loss) reclassified from AOCI to income, Net	118	73
Total accumulated other comprehensive (loss) income, end of period	(722)	(556)
Changes in unrealized pension cost
Changes in AOCI, Gross
Gross, beginning of the period	(169,291)	(138,133)
Gain (Loss) recognized in OCI, Gross	1,930	1,450
Gross, end of the period	(167,361)	(136,683)
Changes in AOCI, Income tax (benefit)
Income tax (benefit), beginning of period	(65,124)	(55,028)
Income tax (benefit), Gain (Loss) recognized in OCI	673	536
Income tax (benefit), end of period	(64,451)	(54,492)
Changes in AOCI, Net
Total accumulated other comprehensive (loss) income, beginning of period	(104,167)	(83,105)
Gain (Loss) recognized in OCI, Net	1,257	914
Total accumulated other comprehensive (loss) income, end of period	(102,910)	(82,191)
Cumulative translation adjustment
Changes in AOCI, Gross
Gross, beginning of the period	245	949
Gain (Loss) recognized in OCI, Gross	(736)	133
Gross, end of the period	(491)	1,082
Changes in AOCI, Income tax (benefit)
Income tax (benefit), beginning of period	(325)	(855)
Income tax (benefit), Gain (Loss) recognized in OCI	367	(71)
Income tax (benefit), end of period	42	(926)
Changes in AOCI, Net
Total accumulated other comprehensive (loss) income, beginning of period	570	1,804
Gain (Loss) recognized in OCI, Net	(1,103)	204
Total accumulated other comprehensive (loss) income, end of period	$ (533)	$ 2,008

Accumulated Other Comprehensive Income Loss Tax

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Other Comprehensive Income Loss Before Reclassifications Tax

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Reclassification From Accumulated Other Comprehensive Income Current Period Tax

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Amount before tax of increase (decrease) in accumulated in equity from transactions and other events and circumstances from non-owner sources. 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 of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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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 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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