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Retirement Benefits (Plan Assets by Category and Fair Value Measurement Level) (Details) - Pension Benefits - USD ($) $ in Thousands	Dec. 29, 2023	Dec. 30, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	$ 160,851	$ 281,175	$ 347,900
Investments categorized in fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	37,576	32,514
Investments measured at net asset value
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	123,275	248,661
Cash and cash equivalents | Level 1 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	1,425	351
Insurance contract | Level 3 | Fair Value, Nonrecurring
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	36,151	32,163
Equity | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	58,280	117,891
U.S. Large Cap | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	40,726	74,838
U.S. Small/Mid Cap | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	0	5,191
International | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	17,554	37,862
Fixed income | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	49,595	93,262
Real estate and other | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	$ 15,400	$ 37,508

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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