Marketable Securities - Available for Sale (Details) - USD ($) $ in Thousands	Jun. 26, 2022	Dec. 26, 2021
Short-term AFS securities
Amortized cost, short-term AFS securities	$ 62,731	$ 340,252
Gross unrealized gains, short-term AFS securities	2	937
Gross unrealized losses, short-term AFS securities	(822)	(114)
Fair value, short-term AFS securities	61,911	341,075
Long-term AFS securities
Amortized cost, long-term AFS securities	240,928	415,951
Gross unrealized gains, long-term AFS securities	0	149
Gross unrealized losses, long-term AFS securities	(10,755)	(2,720)
Fair value, long-term AFS securities	230,173	413,380
U.S. Treasury securities
Short-term AFS securities
Amortized cost, short-term AFS securities	35,776	148,899
Gross unrealized gains, short-term AFS securities	2	692
Gross unrealized losses, short-term AFS securities	(408)	(43)
Fair value, short-term AFS securities	35,370	149,548
Long-term AFS securities
Amortized cost, long-term AFS securities	50,858	119,695
Gross unrealized gains, long-term AFS securities	0	0
Gross unrealized losses, long-term AFS securities	(2,127)	(549)
Fair value, long-term AFS securities	48,731	119,146
Corporate debt securities
Short-term AFS securities
Amortized cost, short-term AFS securities	19,922	107,158
Gross unrealized gains, short-term AFS securities	0	245
Gross unrealized losses, short-term AFS securities	(289)	(69)
Fair value, short-term AFS securities	19,633	107,334
Long-term AFS securities
Amortized cost, long-term AFS securities	157,376	242,764
Gross unrealized gains, long-term AFS securities	0	149
Gross unrealized losses, long-term AFS securities	(7,507)	(1,858)
Fair value, long-term AFS securities	149,869	241,055
Municipal securities
Short-term AFS securities
Amortized cost, short-term AFS securities	7,033	3,999
Gross unrealized gains, short-term AFS securities	0	0
Gross unrealized losses, short-term AFS securities	(125)	(2)
Fair value, short-term AFS securities	6,908	3,997
Long-term AFS securities
Amortized cost, long-term AFS securities	3,890	13,994
Gross unrealized gains, long-term AFS securities	0	0
Gross unrealized losses, long-term AFS securities	(118)	(61)
Fair value, long-term AFS securities	3,772	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	(1,003)	(252)
Fair value, long-term AFS securities	$ 27,801	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