v3.26.3
PENSION AND POSTRETIREMENT BENEFITS - Components of pension and postretirement plan costs (benefits) (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 30, 2026
Aug. 24, 2025
Pension plan    
PENSION AND POSTRETIREMENT BENEFITS    
Service cost $ 1.4 $ 1.4
Interest cost 21.0 22.0
Expected return on plan assets (26.5) (27.8)
Amortization of prior service cost (benefit) 0.4 0.4
Total pension and postretirement cost (benefit) (1.7) (1.7)
Pension plan | Company plans    
PENSION AND POSTRETIREMENT BENEFITS    
Total pension and postretirement cost (benefit) (3.7) (4.0)
Pension plan | Multi employer plan    
PENSION AND POSTRETIREMENT BENEFITS    
Total pension and postretirement cost (benefit) 2.0 2.3
Other postretirement benefits plan    
PENSION AND POSTRETIREMENT BENEFITS    
Interest cost 0.5 0.6
Amortization of prior service cost (benefit) (0.5) (0.4)
Recognized net actuarial gain (0.8) (0.9)
Total pension and postretirement cost (benefit) $ (0.8) $ (0.7)