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Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
December 27, 2014			$ (74,247)
Other comprehensive loss before reclassifications			(14,785)
Amounts reclassified from accumulated other comprehensive income (loss)			(851)
Net current period other comprehensive income (loss)			(15,636)
Income tax expense	$ 263	$ 129	480	$ 148
June 27, 2015	(90,363)		(90,363)
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
December 27, 2014			(19,891)
Other comprehensive loss before reclassifications			(14,785)
Amounts reclassified from accumulated other comprehensive income (loss)			(2,341)
Net current period other comprehensive income (loss)			(17,126)
Income tax expense			0
June 27, 2015	(37,017)		(37,017)
Pension and Other Post-Retirement Benefit Plans
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
December 27, 2014			(54,356)
Other comprehensive loss before reclassifications			0
Amounts reclassified from accumulated other comprehensive income (loss)			1,490
Net current period other comprehensive income (loss)			1,490
Income tax expense			480
June 27, 2015	$ (53,346)		$ (53,346)