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Fair Value Measures (Schedule Of Assets And Liabilities Measured At Fair Value) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Mar. 30, 2019
Dec. 29, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net investment hedge included in prepaid expenses and other current assets $ 674  
Foreign currency contracts included in prepaid expenses and other current assets 208  
Foreign currency contracts included in other current liabilities   $ (309)
Total financial assets and liabilities 142,002 129,140
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial assets and liabilities 141,120 129,449
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net investment hedge included in prepaid expenses and other current assets 674  
Foreign currency contracts included in prepaid expenses and other current assets 208  
Foreign currency contracts included in other current liabilities   (309)
Total financial assets and liabilities 882 (309)
Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 141,120 129,449
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 141,120 $ 129,449