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		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 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- Effective Portion	$ (63)	$ 534	$ 922	$ 863
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 -Effective Portion	343	672	1,019	1,086
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 -Effective Portion	1	(6)	(1)	(8)
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 -Effective Portion	7	(20)	5	(46)
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 -Effective Portion	5	(98)	(72)	(167)
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 -Effective Portion	(1)	(12)	(14)	(23)
Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in Other income (expense), net	$ (1,128)	$ 304	$ 650	$ 906