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Common Stock And Earnings Per Share (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 21, 2020 | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Common Stock And Earnings Per Share [Line Items] |  |  |  |
Shares repurchased and retired |  | 2,009 | 900 | 865
Repurchase of common stock |  | $ 150,000 | $ 105,375 | $ 50,000
Stock Repurchase Program, Authorized Amount |  | $ 30,000 |  |
Subsequent Event [Member] |  |  |  |
Common Stock And Earnings Per Share [Line Items] |  |  |  |
Shares repurchased and retired | 232 |  |  |
Repurchase of common stock | $ 18,604 |  |  |
Average market price | $ 80.26 |  |  |

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