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Retirement Benefits Retirement Benefits (Level 3 Asset Rollforward) (Details) - Fair Value, Recurring - Pension Benefits - Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of year	$ 36,151	$ 32,163
Purchases	2,331	2,593
Redemptions	(4,133)	(2,833)
Unrealized (losses) gains	(1,883)	4,228
Balance, end of year	$ 32,466	$ 36,151

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- Definition

Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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