v3.26.1
PENSION AND POSTRETIREMENT BENEFITS (Details)
$ in Millions
3 Months Ended 12 Months Ended
May 31, 2026
USD ($)
May 25, 2025
USD ($)
Feb. 25, 2024
USD ($)
May 31, 2026
USD ($)
May 25, 2025
USD ($)
item
May 26, 2024
USD ($)
Dec. 31, 2023
Dec. 30, 2023
PENSION AND POSTRETIREMENT BENEFITS                
Noncash pre-tax settlement gain     $ 6.8          
Defined Benefit Plan, Recognized Net Actuarial Gain (Loss), Percentage       10.00%        
Fair Value Investments Ability To Impose Customary Redemption Gates $ 21.9     $ 21.9        
Fair Value Investments Impose Customary Redemption Gates $ 0.0     $ 0.0        
Percentage Providing More Than Plans Contribution       5.00%        
Defined Contribution Plan, Cost       $ 65.3 $ 66.7 $ 62.3    
Maximum [Member]                
PENSION AND POSTRETIREMENT BENEFITS                
Red Zone Multiemployer Plans Funded Percentage       65.00%        
Yellow Zone Multiemployer Plans Funded Percentage 80.00%     80.00%        
Minimum [Member]                
PENSION AND POSTRETIREMENT BENEFITS                
Green Zone Multiemployer Plan Funded Percentage 80.00%     80.00%        
Private Equity Funds [Member]                
PENSION AND POSTRETIREMENT BENEFITS                
Unfunded Commitment For Additional Investment $ 32.0     $ 32.0        
Natural Resources Funds [Member]                
PENSION AND POSTRETIREMENT BENEFITS                
Unfunded Commitment For Additional Investment $ 5.4     $ 5.4        
Fixed Income Securities [Member]                
PENSION AND POSTRETIREMENT BENEFITS                
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 90.00%     90.00%        
Defined Benefit Plan, Equity Securities [Member]                
PENSION AND POSTRETIREMENT BENEFITS                
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 10.00%     10.00%        
Pension plan                
PENSION AND POSTRETIREMENT BENEFITS                
Defined benefit plan benefit obligation transfer amount       $ 40.3 $ 760.6      
Number of retired participants | item         22,000      
Amount of increase in in plan assets         $ 678.3      
Actuarial gain         82.3      
Noncash pre-tax settlement gain $ (2.7) $ 13.0   $ (2.7) $ 13.0      
Defined benefit plan, settlement, payment and plan of assets     $ 135.0          
Discount rate 5.65% 5.91%   5.65% 5.91%   5.20% 5.52%
Employer contributions       $ 11.4 $ 11.9      
Contributions, next fiscal year $ 10.3     10.3        
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)       (66.5) 148.6      
Defined Benefit Plan, Accumulated Benefit Obligation $ 1,680.0 $ 1,690.0   1,680.0 1,690.0      
Defined Benefit Plan Recognized Net Actuarial Gain Loss       $ 25.2 $ 3.5 $ 12.5    
Other postretirement benefits plan                
PENSION AND POSTRETIREMENT BENEFITS                
Discount rate 5.32% 5.43%   5.32% 5.43%      
Employer contributions       $ 5.9 $ 6.7      
Contributions, next fiscal year $ 6.1     6.1        
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)       $ 0.4 $ (4.4)