Derivative Financial Instruments, Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type (Details) - Foreign Exchange Forward [Member] - USD ($) $ in Thousands	Sep. 25, 2016	Dec. 27, 2015	Sep. 27, 2015
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Net unrealized gain (loss)	$ 733	$ (1,044)	$ (40)
Not Designated as Hedging Instrument [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	812	0	93
Unrealized losses	(79)	0	0
Net unrealized gain (loss)	733	0	93
Not Designated as Hedging Instrument [Member] | Accrued liabilities [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	0	416	360
Unrealized losses	0	(1,460)	(493)
Net unrealized gain (loss)	0	(1,044)	(133)
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Net unrealized gain (loss)	18,992	107,438	118,558
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	34,179	78,910	81,718
Unrealized losses	(9,247)	(5,932)	(9,717)
Net unrealized gain (loss)	24,932	72,978	72,001
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	20,974	35,366	48,111
Unrealized losses	(7,524)	(710)	(989)
Net unrealized gain (loss)	13,450	34,656	47,122
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Accrued liabilities [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	4,352	0	62
Unrealized losses	(19,420)	0	(566)
Net unrealized gain (loss)	(15,068)	0	(504)
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	992	241	0
Unrealized losses	(5,314)	(437)	(61)
Net unrealized gain (loss)	$ (4,322)	$ (196)	$ (61)