Marketable Securities - Available-for-sale Securities - Continuous Loss Position (Details) - USD ($) $ in Thousands	Jun. 26, 2022	Dec. 26, 2021
Total short-term AFS securities
Short-term AFS securities
Fair value, less than 12 months	$ 57,383	$ 116,164
Gross unrealized losses, less than 12 months	(822)	(114)
Fair value, greater than 12 months	0	0
Gross unrealized losses, greater than 12 months	0	0
Fair value, total	57,383	116,164
Gross unrealized losses, total	(822)	(114)
Total long-term AFS securities
Long-term AFS securities
Fair value, less than 12 months	209,910	396,347
Gross unrealized losses, less than 12 months	(9,936)	(2,720)
Fair value, greater than 12 months	20,263	0
Gross unrealized losses, greater than 12 months	(819)	0
Fair value, total	230,173	396,347
Gross unrealized losses, total	(10,755)	(2,720)
U.S. Treasury securities
Short-term AFS securities
Fair value, less than 12 months	30,842	61,018
Gross unrealized losses, less than 12 months	(408)	(43)
Fair value, greater than 12 months	0	0
Gross unrealized losses, greater than 12 months	0	0
Fair value, total	30,842	61,018
Gross unrealized losses, total	(408)	(43)
Long-term AFS securities
Fair value, less than 12 months	45,986	119,146
Gross unrealized losses, less than 12 months	(2,023)	(549)
Fair value, greater than 12 months	2,745	0
Gross unrealized losses, greater than 12 months	(104)	0
Fair value, total	48,731	119,146
Gross unrealized losses, total	(2,127)	(549)
Corporate debt securities
Short-term AFS securities
Fair value, less than 12 months	19,633	53,148
Gross unrealized losses, less than 12 months	(289)	(69)
Fair value, greater than 12 months	0	0
Gross unrealized losses, greater than 12 months	0	0
Fair value, total	19,633	53,148
Gross unrealized losses, total	(289)	(69)
Long-term AFS securities
Fair value, less than 12 months	138,137	224,022
Gross unrealized losses, less than 12 months	(7,006)	(1,858)
Fair value, greater than 12 months	11,732	0
Gross unrealized losses, greater than 12 months	(501)	0
Fair value, total	149,869	224,022
Gross unrealized losses, total	(7,507)	(1,858)
U.S. governmental agency securities
Long-term AFS securities
Fair value, less than 12 months	22,015	39,246
Gross unrealized losses, less than 12 months	(789)	(252)
Fair value, greater than 12 months	5,786	0
Gross unrealized losses, greater than 12 months	(214)	0
Fair value, total	27,801	39,246
Gross unrealized losses, total	(1,003)	(252)
Municipal securities
Short-term AFS securities
Fair value, less than 12 months	6,908	1,998
Gross unrealized losses, less than 12 months	(125)	(2)
Fair value, greater than 12 months	0	0
Gross unrealized losses, greater than 12 months	0	0
Fair value, total	6,908	1,998
Gross unrealized losses, total	(125)	(2)
Long-term AFS securities
Fair value, less than 12 months	3,772	13,933
Gross unrealized losses, less than 12 months	(118)	(61)
Fair value, greater than 12 months	0	0
Gross unrealized losses, greater than 12 months	0	0
Fair value, total	3,772	13,933
Gross unrealized losses, total	$ (118)	$ (61)