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PENSION AND POSTRETIREMENT BENEFITS (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 26, 2013
May 27, 2012
May 29, 2011
Change in Plan Assets      
Fair value of plan assets at beginning of year $ 2,766.6    
Investment and administrative expenses (2,135.6) (1,983.6) (1,499.0)
Fair value of plan assets at end of year 3,343.3 2,766.6  
Pension Benefits
     
Change in Benefit Obligation      
Benefit obligation at beginning of year 3,328.3 2,881.4  
Service cost 81.8 68.7 59.7
Interest cost 150.1 149.2 147.5
Amendments 6.8 5.3  
Actuarial loss 114.3 337.5  
Curtailments (0.4)    
Benefits paid (147.8) (138.8)  
Business combination 284.4 25.0  
Benefit obligation at ending of year 3,817.5 3,328.3 2,881.4
Change in Plan Assets      
Fair value of plan assets at beginning of year 2,766.6 2,543.9  
Actual return on plan assets 457.1 24.8  
Employer contributions 19.8 326.4  
Investment and administrative expenses (16.5) (14.2)  
Benefits paid (147.8) (138.8)  
Business combination 264.1 24.5  
Fair value of plan assets at end of year 3,343.3 2,766.6 2,543.9
Other Benefits
     
Change in Benefit Obligation      
Benefit obligation at beginning of year 282.7 322.6  
Service cost 0.6 0.6 0.6
Interest cost 10.5 13.2 16.3
Plan participants' contributions 5.3 6.7  
Amendments 0 (40.6)  
Actuarial loss (7.6) 11.6  
Benefits paid (27.2) (36.0)  
Business combination 38.5 4.6  
Benefit obligation at ending of year 302.8 282.7 322.6
Change in Plan Assets      
Fair value of plan assets at beginning of year 0.1 0.1  
Employer contributions 21.9 29.3  
Plan participants' contributions 5.3 6.7  
Benefits paid (27.2) (36.0)  
Fair value of plan assets at end of year $ 0.1 $ 0.1 $ 0.1