Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measures (Schedule Of Assets And Liabilities Measured At Fair Value) (Details)

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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
Sep. 28, 2019
Dec. 29, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency contracts included in prepaid expenses and other current assets $ 611  
Foreign currency contracts included in other current liabilities   $ (309)
Total financial assets and liabilities 129,727 129,140
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial assets and liabilities 129,116 129,449
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency contracts included in prepaid expenses and other current assets 611  
Foreign currency contracts included in other current liabilities   (309)
Total financial assets and liabilities 611 (309)
Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 129,116 129,449
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 $ 129,116 $ 129,449