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Retirement Benefits (Plan Assets by Category and Fair Value Measurement Level) (Details) - Pension Benefits - USD ($) $ in Thousands	Dec. 27, 2024	Dec. 29, 2023	Dec. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	$ 182,546	$ 160,851	$ 281,175
Investments categorized in fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	32,581	37,576
Investments measured at net asset value
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	149,965	123,275
Cash and cash equivalents | Level 1 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	115	1,425
Insurance contract | Level 3 | Fair Value, Nonrecurring
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	32,466	36,151
Equity | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	81,089	58,280
U.S. Large Cap | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	64,645	40,726
International | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	16,444	17,554
Fixed income | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	64,331	49,595
Real estate and other | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value, plan assets	$ 4,545	$ 15,400

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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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