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Summary Of Significant Accounting Policies (Schedule Of Assets And Liabilities Measured At Fair Value) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Dec. 29, 2018
Dec. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds included in cash equivalents $ 129,449 $ 106,090
Foreign currency contracts included in other current liabilities (309) (139)
Total financial assets and liabilities 129,140 105,951
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds included in cash equivalents 129,449 106,090
Total financial assets and liabilities 129,449 106,090
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency contracts included in other current liabilities (309) (139)
Total financial assets and liabilities $ (309) $ (139)