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
Mar. 28, 2020
Dec. 28, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net investment hedge included in prepaid expenses and other current assets $ 1,939  
Foreign currency contracts included in prepaid expenses and other current assets 323  
Foreign currency contracts included in other current liabilities   $ (764)
Total financial assets and liabilities 141,666 179,268
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total financial assets and liabilities 139,404 180,032
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 1,939  
Foreign currency contracts included in prepaid expenses and other current assets 323  
Foreign currency contracts included in other current liabilities   (764)
Total financial assets and liabilities 2,262 (764)
Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 139,404 180,032
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 $ 139,404 $ 180,032