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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 |

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