Derivative Financial Instruments, Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 25, 2016
Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	$ 13,666	$ 34,265
Unrealized losses	(10,319)	(2,075)
Net unrealized gain (loss)	3,347	32,190
Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	11,255	51,839
Unrealized losses	(2,376)	(792)
Net unrealized gain (loss)	8,879	51,047
Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	4,546	0
Unrealized losses	(13,437)	0
Net unrealized gain (loss)	(8,891)	0
Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	4,215	8,481
Unrealized losses	(15,484)	(19,790)
Net unrealized gain (loss)	(11,269)	(11,309)
Not Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	1,793	0
Unrealized losses	(4,684)	0
Net unrealized gain (loss)	(2,891)	0
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Net unrealized gain (loss)	(2,891)	4,657
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	0	5,854
Unrealized losses	0	(1,197)
Net unrealized gain (loss)	$ 0	$ 4,657