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Defined Benefit Plans - Fair Value of Pension Assets by Major Category of Plan Assets (Detail) - USD ($) $ in Millions | Dec. 27, 2025 | Dec. 28, 2024
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total plan asstes at fair value |  | $ 188.3 |  | $ 177.1 |
Fair value excluding investments measured at net asset value |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total plan asstes at fair value |  | 173.4 |  | 26.4 |
Investments Measured at Net Asset Value |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total plan asstes at fair value |  | 14.9 |  | 150.7 |
Cash and cash equivalents |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total plan asstes at fair value |  | 34.1 |  | 2.6 |
Cash and cash equivalents | Level 1 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total plan asstes at fair value |  | 34.1 |  | 2.6 |
Other investments |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total plan asstes at fair value |  | 139.3 | [1] | 23.8 | [2]
Other investments | Level 2 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total plan asstes at fair value | [2] |  |  | 23.8 |
Equity |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total plan asstes at fair value |  |  |  | 27.3 |
Equity | Level 3 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total plan asstes at fair value | [1] | 139.3 |  |  |
Fixed income |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total plan asstes at fair value |  | $ 14.9 |  | 95.1 |
Multi-strategy hedge funds |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total plan asstes at fair value |  |  |  | 12.1 |
Real estate |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total plan asstes at fair value |  |  |  | $ 16.2 |
[1] | (a) - Other investments consist of buy-in annuity contract assets.
[2] | (a) - Other investments consist of future contracts on U.S. Treasury notes and bonds primarily used to hedge interest rate exposures.

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