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Retirement Benefits (Plan Assets by Category and Fair Value Measurement Level) (Details) - Pension Benefits - USD ($)
$ in Thousands
Dec. 30, 2022
Dec. 31, 2021
Dec. 25, 2020
Defined Benefit Plan Disclosure [Line Items]      
Fair value, plan assets $ 281,175 $ 347,900 $ 373,565
Investments categorized in fair value hierarchy      
Defined Benefit Plan Disclosure [Line Items]      
Fair value, plan assets 32,514 31,229  
Investments measured at net asset value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value, plan assets 248,661 316,671  
Cash and cash equivalents | Level 1 | Fair Value, Recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value, plan assets 351 303  
Insurance contract | Level 3 | Fair Value, Nonrecurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value, plan assets 32,163 30,926  
Equity | Fair Value, Recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value, plan assets 117,891 178,035  
U.S. Large Cap | Fair Value, Recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value, plan assets 74,838 110,569  
U.S. Small/Mid Cap | Fair Value, Recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value, plan assets 5,191 11,338  
International | Fair Value, Recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value, plan assets 37,862 56,128  
Fixed income | Fair Value, Recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value, plan assets 93,262 130,774  
Real estate and other | Fair Value, Recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value, plan assets $ 37,508 $ 7,862