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PENSION AND POSTRETIREMENT BENEFITS (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May. 31, 2015 | May. 25, 2014 | May. 26, 2013
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, expected withdrawal costs | $ 0.4 | $ 0.2 | $ 14.2
Expenses related to the defined contribution plans | $ 40.6 | $ 40.2 | 30.7
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 | $ 832.7 |  |
Fair value investments impose customary redemption gates | 1.5 |  |
Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Unfunded commitment for additional investment | 96.1 |  |
Private energy funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Unfunded commitment for additional investment | 47.6 |  |
Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Unfunded commitment for additional investment | 29.1 |  |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | 3,900.0 | $ 3,900.0 |
Special termination benefits | 6.9 | 0.4 | 0.0
Anticipated contributions | 13.0 |  |
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Special termination benefits | 0.0 | $ 0.0 | $ 0.0
Anticipated contributions | 23.7 |  |
Ardent Mills |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Special termination benefits | $ 6.9 |  |

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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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