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PENSION AND POSTRETIREMENT BENEFITS (Level 3) (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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