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PENSION AND POSTRETIREMENT BENEFITS (Level 3) (Details) - USD ($)
$ in Millions
12 Months Ended
May 29, 2016
May 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair Value, $ 942.3 $ 730.8
Realized Gains (Losses) 2.8 3.5
Unrealized Gains (Losses) 22.3 41.0
Net Purchases and Sales 41.6 167.0
Fair Value, 1,009.0 942.3
Real estate funds    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair Value, 344.9 170.6
Realized Gains (Losses) 0.4 0.5
Unrealized Gains (Losses) 46.1 21.0
Net Purchases and Sales 33.6 152.8
Fair Value, 425.0 344.9
Multi-strategy hedge funds    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair Value, 484.5 462.3
Realized Gains (Losses) 0.2 0.3
Unrealized Gains (Losses) (17.2) 22.8
Net Purchases and Sales (1.1) (0.9)
Fair Value, 466.4 484.5
Private equity funds    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair Value, 93.0 81.3
Realized Gains (Losses) 2.2 2.7
Unrealized Gains (Losses) (0.5) (3.3)
Net Purchases and Sales (5.0) 12.3
Fair Value, 89.7 93.0
Private natural resources funds    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair Value, 19.9 16.6
Realized Gains (Losses) 0.0 0.0
Unrealized Gains (Losses) (6.1) 0.5
Net Purchases and Sales 14.1 2.8
Fair Value, $ 27.9 $ 19.9