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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Dec. 26, 2020
Dec. 28, 2019
Accounting Policies [Abstract]    
Unrealized losses on available-for-sale marketable securities $ (126) $ (352)
Translation adjustments and other 5,184 53
Unrealized gains (losses) on derivative instruments 828 (360)
Accumulated other comprehensive income (loss) $ 5,886 $ (659)