Derivative Financial Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings	$ (1,528)	$ 675
Ineffective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings	65	(1)
Cash Flow Hedging [Member] | Cost of Sales [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings	(1,019)	341
Cash Flow Hedging [Member] | Royalty Expense[Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings	(350)	(141)
Cash Flow Hedging [Member] | Sales [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings	(159)	475
Fair Value Hedging [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ (4,117)	$ (3,107)