Unaudited Condensed Consolidated Statement of Partners' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2016	Sep. 27, 2015	Sep. 25, 2016	Sep. 27, 2015
Statement of Partners' Capital [Abstract]
Foreign currency translation adjustment, tax	$ (803)	$ (4,418)	$ 3,131	$ (7,554)
Unrealized loss on cash flow hedging derivatives, tax			$ (279)	$ 758
Partnership distribution declared, amount per limited partnership unit (in dollars per share)	$ 2.475	$ 2.25	$ 2.475	$ 2.25