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Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
December 27, 2014			$ (74,247)
Other comprehensive loss before reclassifications			(45,697)
Amounts reclassified from accumulated other comprehensive income (loss)			(156)
Net current period other comprehensive income (loss)			(45,853)
Income tax expense	$ 220	$ 125	700	$ 273
September 26, 2015	(120,800)		(120,800)
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
December 27, 2014			(19,891)
Other comprehensive loss before reclassifications			(45,697)
Amounts reclassified from accumulated other comprehensive income (loss)			(2,341)
Net current period other comprehensive income (loss)			(48,038)
Income tax expense			0
September 26, 2015	(67,929)		(67,929)
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)			2,185
Net current period other comprehensive income (loss)			2,185
Income tax expense			700
September 26, 2015	$ (52,871)		$ (52,871)