Marketable Securities - Available for Sale (Details) - USD ($) $ in Thousands	Mar. 27, 2022	Dec. 26, 2021
Short-term AFS securities
Amortized cost, short-term AFS securities	$ 53,162	$ 340,252
Gross unrealized gains, short-term AFS securities	16	937
Gross unrealized losses, short-term AFS securities	(390)	(114)
Fair value, short-term AFS securities	52,788	341,075
Long-term AFS securities
Amortized cost, long-term AFS securities	262,105	415,951
Gross unrealized gains, long-term AFS securities	0	149
Gross unrealized losses, long-term AFS securities	(9,290)	(2,720)
Fair value, long-term AFS securities	252,815	413,380
U.S. Treasury securities
Short-term AFS securities
Amortized cost, short-term AFS securities	28,481	148,899
Gross unrealized gains, short-term AFS securities	4	692
Gross unrealized losses, short-term AFS securities	(217)	(43)
Fair value, short-term AFS securities	28,268	149,548
Long-term AFS securities
Amortized cost, long-term AFS securities	56,576	119,695
Gross unrealized gains, long-term AFS securities	0	0
Gross unrealized losses, long-term AFS securities	(1,892)	(549)
Fair value, long-term AFS securities	54,684	119,146
Corporate debt securities
Short-term AFS securities
Amortized cost, short-term AFS securities	22,681	107,158
Gross unrealized gains, short-term AFS securities	12	245
Gross unrealized losses, short-term AFS securities	(157)	(69)
Fair value, short-term AFS securities	22,536	107,334
Long-term AFS securities
Amortized cost, long-term AFS securities	167,793	242,764
Gross unrealized gains, long-term AFS securities	0	149
Gross unrealized losses, long-term AFS securities	(6,365)	(1,858)
Fair value, long-term AFS securities	161,428	241,055
Municipal securities
Short-term AFS securities
Amortized cost, short-term AFS securities	2,000	3,999
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(16)	(2)
Fair value, short-term AFS securities	1,984	3,997
Long-term AFS securities
Amortized cost, long-term AFS securities	8,932	13,994
Gross unrealized gains, long-term AFS securities	0	0
Gross unrealized losses, long-term AFS securities	(183)	(61)
Fair value, long-term AFS securities	8,749	13,933
Certificates of deposit
Short-term AFS securities
Amortized cost, short-term AFS securities		55,551
Gross unrealized gains, short-term AFS securities		0
Gross unrealized losses, short-term AFS securities		0
Fair value, short-term AFS securities		55,551
U.S. governmental agency securities
Short-term AFS securities
Amortized cost, short-term AFS securities		3,500
Gross unrealized gains, short-term AFS securities		0
Fair value, short-term AFS securities		3,500
Long-term AFS securities
Amortized cost, long-term AFS securities	28,804	39,498
Gross unrealized gains, long-term AFS securities	0	0
Gross unrealized losses, long-term AFS securities	(850)	(252)
Fair value, long-term AFS securities	$ 27,954	39,246
Commercial paper
Short-term AFS securities
Amortized cost, short-term AFS securities		21,145
Gross unrealized gains, short-term AFS securities		0
Gross unrealized losses, short-term AFS securities		0
Fair value, short-term AFS securities		$ 21,145