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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. 28, 2019 | Dec. 29, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds included in cash equivalents | $ 180,032 | $ 129,449
Foreign currency contracts included in other current liabilities | (764) | (309)
Total financial assets and liabilities | 179,268 | 129,140
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 | 180,032 | 129,449
Total financial assets and liabilities | 180,032 | 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 other current liabilities | (764) | (309)
Total financial assets and liabilities | $ (764) | $ (309)

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