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PENSION AND POSTRETIREMENT BENEFITS (Level 3) (Details) - USD ($)
$ in Millions
12 Months Ended
May. 31, 2015
May. 25, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair Value, $ 730.8 $ 592.3
Realized Gains (Losses) 3.5 3.8
Unrealized Gains (Losses) 41.0 42.5
Net Purchases and Sales 167.0 92.2
Fair Value, 942.3 730.8
Real estate funds    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair Value, 170.6 91.5
Realized Gains (Losses) 0.5 0.4
Unrealized Gains (Losses) 21.0 11.8
Net Purchases and Sales 152.8 66.9
Fair Value, 344.9 170.6
Multi-strategy hedge funds    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair Value, 462.3 413.9
Realized Gains (Losses) 0.3 0.2
Unrealized Gains (Losses) 22.8 21.2
Net Purchases and Sales (0.9) 27.0
Fair Value, 484.5 462.3
Private equity funds    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair Value, 81.3 79.1
Realized Gains (Losses) 2.7 3.2
Unrealized Gains (Losses) (3.3) 8.0
Net Purchases and Sales 12.3 (9.0)
Fair Value, 93.0 81.3
Private natural resources funds    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair Value, 16.6 7.8
Realized Gains (Losses) 0.0 0.0
Unrealized Gains (Losses) 0.5 1.5
Net Purchases and Sales 2.8 7.3
Fair Value, $ 19.9 $ 16.6