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INVESTMENTS IN JOINT VENTURES (Narrative) (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 29, 2014 USD ($) | May 29, 2016 USD ($) | Feb. 28, 2016 USD ($) | Nov. 29, 2015 USD ($) | Aug. 30, 2015 USD ($) | May 31, 2015 USD ($) | Feb. 22, 2015 USD ($) | Aug. 24, 2014 USD ($) | May 25, 2014 USD ($) facility | Nov. 23, 2014 USD ($) | May 29, 2016 USD ($) | May 31, 2015 USD ($) | May 25, 2014 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax |  | $ 146.0 | $ 18.7 | $ (6.8) | $ (1,319.8) | $ (23.0) | $ (1,165.0) | $ 389.1 |  | $ (202.2) | $ (1,161.9) | $ (1,001.1) | $ (310.1)
Gain on the settlement of a pension plan of an international potato venture |  |  |  |  |  |  |  |  |  |  | 17.7 |  |
Sales to equity method investments |  |  |  |  |  |  |  |  |  |  | 16.6 | 9.5 |
Purchases from equity method investments |  |  |  |  |  |  |  |  |  |  | 90.8 | 98.0 |
Dividends received from equity method investments |  |  |  |  |  |  |  |  |  |  | 78.3 | 91.3 |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  |  | 2,209.4 | 1,545.3 | $ 1,778.9
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of equity method investments |  | 910.8 |  |  |  | 853.0 |  |  |  |  | 910.8 | 853.0 |
Ardent Mills |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment | $ 49.0 |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage | 44.00% |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of business | $ 391.4 |  |  |  |  |  |  |  |  |  |  |  |
Gain in income from discontinued operations |  |  |  |  |  |  |  |  |  |  | 625.6 |  |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | 379.6 |  |
Ardent Mills | Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  |  | 9.7 | 14.1 |
Three flour milling facilities |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of business |  |  |  |  |  |  |  |  | $ 163.0 |  |  |  |
Number of flour mining facilities sold | facility |  |  |  |  |  |  |  |  | 3 |  |  |  |
Ardent Mills | Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of equity method investments |  | $ 732.8 |  |  |  | $ 708.4 |  |  |  |  | $ 732.8 | $ 708.4 |

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