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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
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.