v3.26.1
PENSION AND POSTRETIREMENT BENEFITS - Components of pension and postretirement plan costs (benefits) (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2026
May 25, 2025
May 26, 2024
Pension plan      
PENSION AND POSTRETIREMENT BENEFITS      
Projected benefit obligation $ 82.7 $ 89.8  
Accumulated benefit obligation 82.7 89.8  
Service cost 5.4 5.5 $ 5.8
Interest cost 87.8 136.1 144.7
Expected return on plan assets (109.6) (146.3) (141.3)
Amortization of prior service cost (benefit) 1.5 1.6 1.6
Recognized net actuarial gain (25.2) (3.5) (12.5)
Settlement loss (gain) 2.7 (13.0) 1.1
Total pension and postretirement cost (benefit) (28.3) (10.1) 8.4
Pension plan | Company plans      
PENSION AND POSTRETIREMENT BENEFITS      
Total pension and postretirement cost (benefit) (37.4) (19.6) (0.6)
Pension plan | Multi employer plan      
PENSION AND POSTRETIREMENT BENEFITS      
Total pension and postretirement cost (benefit) 9.1 9.5 9.0
Other postretirement benefits plan      
PENSION AND POSTRETIREMENT BENEFITS      
Service cost 0.1 0.1 0.1
Interest cost 2.2 2.4 2.5
Amortization of prior service cost (benefit) (1.7) (1.7) (1.7)
Recognized net actuarial gain (3.6) (1.5) (4.7)
Total pension and postretirement cost (benefit) (3.0) (0.7) (3.8)
Other postretirement benefits plan | Company plans      
PENSION AND POSTRETIREMENT BENEFITS      
Total pension and postretirement cost (benefit) $ (3.0) $ (0.7) $ (3.8)