Derivative Financial Instruments (Schedule Of Company's Derivative Instruments On Other Comprehensive Income And The Consolidated Statement Of Operations) (Details) - Derivatives Designated As Hedging Instruments [Member] - Foreign Currency Forward Contracts [Member] - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in OCI-Effective Portion	[1]	$ (416)	$ 401	$ (1,299)	$ (170)
Gain or (Loss) Reclassified from OCI into Income-Effective Portion	[1]	(426)	262	(1,197)	(236)
Amount of Gain or (Loss) Recognized in Income and Excluded from Effectiveness Testing		(9)	(41)	(43)	(107)
Other Income (expense), Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income and Excluded from Effectiveness Testing		(9)	(41)	(43)	(107)
Net Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from OCI into Income-Effective Portion	[1]	(552)	320	(1,474)	(221)
Cost Of Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from OCI into Income-Effective Portion	[1]	3	0	7	8
Operating Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from OCI into Income-Effective Portion	[1]	$ 123	$ (58)	$ 270	$ (23)

[1] Refer to Note 8, Stockholders' Equity, which summarizes the accumulated other comprehensive income activity related to derivatives.