Marketable Securities - Amortized Cost (Details) - USD ($) $ in Thousands	Mar. 26, 2022	Dec. 25, 2021
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 197,153	$ 196,878
Gross Unrealized Holding Gains	2,018	4,755
Gross Unrealized Holding Losses	(6,710)	(2,397)
Fair Value	192,461
Bonds [Member]
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	152,238	151,947
Gross Unrealized Holding Gains	2,012	4,753
Gross Unrealized Holding Losses	(6,648)	(2,384)
Fair Value	147,602	154,315
Commercial Paper [Member]
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	44,915	44,931
Gross Unrealized Holding Gains	6	2
Gross Unrealized Holding Losses	(62)	(13)
Fair Value	$ 44,859	$ 44,920

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amortized cost, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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