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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. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds included in cash equivalents $ 106,090 $ 27,917
Foreign currency contracts included in prepaid expenses and other current assets   4
Foreign currency contracts included in other current liabilities (139)  
Total financial assets and liabilities 105,951 27,921
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 106,090 27,917
Total financial assets and liabilities 106,090 27,917
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   4
Foreign currency contracts included in other current liabilities (139)  
Total financial assets and liabilities $ (139) $ 4