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Equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 24, 2016	Sep. 26, 2015	Sep. 24, 2016	Sep. 26, 2015
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
Other comprehensive loss before reclassifications			$ (31,735)
Amounts reclassified from accumulated other comprehensive income (loss)			1,961
Net current period other comprehensive income			(29,774)
Income tax expense	$ 140	$ 220	424	$ 700
Foreign Currency Translation Adjustment and Other
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
December 26, 2015			(82,977)
Other comprehensive loss before reclassifications			(31,735)
Amounts reclassified from accumulated other comprehensive income (loss)			0
Net current period other comprehensive income			(31,735)
Income tax expense			0
September 24, 2016	(114,712)		(114,712)
Pension and Other Post-Retirement Benefit Plans
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
December 26, 2015			(52,571)
Other comprehensive loss before reclassifications			0
Amounts reclassified from accumulated other comprehensive income (loss)			1,961
Net current period other comprehensive income			1,961
Income tax expense	100	$ 200	424	$ 700
September 24, 2016	(51,034)		(51,034)
Total
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
December 26, 2015			(135,548)
September 24, 2016	$ (165,746)		$ (165,746)