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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 30, 2022	Dec. 31, 2021	Dec. 25, 2020
Class of Stock
Foreign Currency Transaction Loss, before Tax		$ 24,000
Pension Benefits
Class of Stock
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ 0	(12,285)	$ 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ 0	(12,285)	$ 0
Pension Plan - Blue and Gray Plans | Pension Benefits
Class of Stock
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		12,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		$ 12,000
Cumulative Preferred Stock
Class of Stock
Preferred stock authorized	22,549
Preferred stock par value	$ 100
Preferred Stock
Class of Stock
Preferred stock authorized	3,000,000
Preferred stock par value	$ 1

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Amount before tax of foreign currency transaction realized and unrealized loss recognized in the income statement.

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