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PENSION AND POSTRETIREMENT BENEFITS (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
May 29, 2016
May 31, 2015
May 25, 2014
Defined Benefit Plan Disclosure [Line Items]      
Special termination benefits $ 25.6    
Defined contribution plan, expected withdrawal costs 31.8 $ 0.4 $ 0.2
Expenses related to the defined contribution plans 35.4 $ 40.6 40.2
Multiemployer plan withdrawal costs $ 29.8    
Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Red zone multiemployer plans funded percentage 65.00%    
Yellow zone multiemployer plans funded percentage 80.00%    
Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Green zone multiemployer plan funded percentage 80.00%    
Percentage of plan's total contribution under Forms 5500   5.00%  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value investments ability to impose customary redemption gates $ 896.1    
Fair value investments impose customary redemption gates 0.3    
Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Unfunded commitment for additional investment 94.3    
Private energy funds      
Defined Benefit Plan Disclosure [Line Items]      
Unfunded commitment for additional investment 41.6    
Real estate funds      
Defined Benefit Plan Disclosure [Line Items]      
Unfunded commitment for additional investment 15.5    
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 3,800.0 $ 3,900.0  
Special termination benefits 25.6 6.9 0.4
Anticipated contributions 12.5    
Recognized net actuarial gain (loss) (348.5) (6.9) (2.7)
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Special termination benefits 0.0 0.0 0.0
Anticipated contributions 22.1    
Recognized net actuarial gain (loss) $ (0.1) (3.5) $ (6.7)
Ardent Mills      
Defined Benefit Plan Disclosure [Line Items]      
Special termination benefits   $ 6.9