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Retirement Benefits (Amounts Recognized in Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 25, 2020
Amounts recognized in consolidated balance sheets
Non-current liabilities	$ 106,897	$ 184,747
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Prepaid Expense, Noncurrent	0	9,144
Amounts recognized in consolidated balance sheets
Current liabilities	1,769	1,750
Non-current liabilities	68,382	144,481
Net	70,151	137,087
Postretirement Medical Benefits
Defined Benefit Plan Disclosure [Line Items]
Prepaid Expense, Noncurrent	0	0
Amounts recognized in consolidated balance sheets
Current liabilities	1,768	1,714
Non-current liabilities	30,354	32,744
Net	$ 32,122	$ 34,458

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