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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 26, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements for Investments [Table Text Block]
Following is a summary of fair value measurements for investments as of September 26, 2020 and December 28, 2019:
Fair ValueLevel 1Level 2Level 3
(Amounts are in thousands)
September 26, 2020$10,816,227 1,780,018 9,036,209 — 
December 28, 20198,426,385 2,028,547 6,397,838 —