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Summary of Significant Accounting Policies - Recent Accounting Standards Not Yet Adopted (Details) - USD ($) $ in Thousands | Sep. 26, 2020 | Dec. 29, 2019 | Dec. 28, 2019 | Dec. 30, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Right-of-use assets | $ 123,390 |  | $ 130,173 |
ASU 2016-02 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Right-of-use assets |  |  |  | $ 82,300
Recognize lease liabilities |  |  |  | $ 106,800
ASU 2016-13 Financial Instruments-Credit Losses Topic 326 | Retained Earnings | Cumulative-effect adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Opening balance of retained earnings at December 28, 2019 |  | $ (200) |  |

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