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Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Sep. 28, 2021 | Mar. 30, 2021 | Dec. 29, 2020
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Recent Accounting Pronouncements |  |  |
Retained Earnings (Accumulated Deficit) | $ 1,167,001 |  | $ 1,110,087
Cumulative effect of adopting ASU 2020-06 |  |  |
Recent Accounting Pronouncements |  |  |
Retained Earnings (Accumulated Deficit) | $ 4,800 | $ 4,800 |

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