Derivative Financial Instruments, Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 25, 2011	Dec. 25, 2011
Derivatives, Fair Value [Line Items]
Total assets derivatives, Cash Flow Hedges	$ 5,073	$ 12,290	$ 9,799
Total liability derivatives, Cash Flow Hedges	(1,859)	(9,462)	(59)
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	5,677	15,313	11,965
Unrealized losses	(2,692)	(4,936)	(4,187)
Net unrealized gain (loss)	2,985	10,377	7,778
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	2,448	1,913	2,113
Unrealized losses	(360)	0	(92)
Net unrealized gain (loss)	2,088	1,913	2,021
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Accrued liabilities [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	2,816	415	12
Unrealized losses	(4,617)	(3,712)	(50)
Net unrealized gain (loss)	(1,801)	(3,297)	(38)
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	104	739	0
Unrealized losses	(162)	(6,904)	(21)
Net unrealized gain (loss)	(58)	(6,165)	(21)
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	1,119	0	0
Unrealized losses	(504)	0	0
Net unrealized gain (loss)	615	0	0
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Accrued liabilities [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	0	3,234	41
Unrealized losses	0	(1,034)	(786)
Net unrealized gain (loss)	0	2,200	(745)
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Unrealized gains	74	0	0
Unrealized losses	(527)	0	(1,104)
Net unrealized gain (loss)	$ (453)	$ 0	$ (1,104)