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Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 27, 2021
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments [Table Text Block]
Following is a summary of fair value measurements for investments as of March 27, 2021 and December 26, 2020:
Fair ValueLevel 1Level 2Level 3
(Amounts are in thousands)
March 27, 2021$12,286,609 1,756,758 10,529,851 — 
December 26, 202011,288,199 1,465,987 9,822,212 —