Derivative Financial Instruments (Schedule of Company's Derivative Instruments on Accumulated Other Comprehensive Income and the Unaudited Condensed Consolidated Statement of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign Exchange Forward
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in accumulated other comprehensive income (loss) - Effective Portion	$ (1,530)	$ 458	$ (608)	$ 1,322
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign Exchange Forward | Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income into Income (loss) -Effective Portion	(1,614)	548	(595)	1,634
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign Exchange Forward | Cost of revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income into Income (loss) -Effective Portion	3	(2)	2	(10)
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign Exchange Forward | Research and development
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income into Income (loss) -Effective Portion	27	(2)	32	(47)
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign Exchange Forward | Sales and marketing
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income into Income (loss) -Effective Portion	167	(42)	95	(209)
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign Exchange Forward | General and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income into Income (loss) -Effective Portion	24	(7)	10	(30)
Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in Other income (expense), net	$ (1,424)	$ 1,540	$ (774)	$ 2,446