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Benefits - Accumulated benefit obligations in excess of fair value of plan assets (Details) - USD ($)
$ in Millions
Dec. 01, 2024
Nov. 26, 2023
Accumulated benefit obligations in excess of plan assets [Abstract]    
Aggregate accumulated benefit obligation $ 117.8 $ 115.2
Projected benefit obligations in excess of plan assets [Abstract]    
Aggregate projected benefit obligation 121.4 118.6
Aggregate fair value of plan assets $ 1.0 $ 0.9