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Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Sep. 28, 2021
Mar. 30, 2021
Dec. 29, 2020
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