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INVESTMENTS IN JOINT VENTURES (Narrative) (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May. 29, 2014 USD ($) | May. 31, 2015 USD ($) | Feb. 22, 2015 USD ($) | Nov. 23, 2014 USD ($) | Aug. 24, 2014 USD ($) | May. 25, 2014 USD ($) facility | Feb. 23, 2014 USD ($) | Nov. 24, 2013 USD ($) | Aug. 25, 2013 USD ($) | May. 31, 2015 USD ($) | May. 25, 2014 USD ($) | May. 26, 2013 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash payment |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 1.5
Gain in income from discontinued operations |  |  |  |  |  |  |  |  |  | 617.4 | 223.8 | 126.0
Income from discontinued operations |  | $ 4.6 | $ (0.6) | $ (10.7) | $ 373.3 | $ 74.8 | $ 10.8 | $ 42.0 | $ 13.8 | 366.6 | 141.4 | 87.7
Sales to equity method investments |  |  |  |  |  |  |  |  |  | 9.5 |  |
Purchases from equity method investments |  |  |  |  |  |  |  |  |  | 142.2 |  |
Dividends received from equity method investments |  |  |  |  |  |  |  |  |  | 91.3 |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | 3,472.1 | 2,771.2 | $ 2,065.9
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 from discontinued operations |  |  |  |  |  |  |  |  |  | 379.6 |  |
Ardent Mills | Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | 14.1 |  |
Ardent Mills | Other Assets |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of equity method investments |  | $ 853.0 |  |  |  | 131.2 |  |  |  | $ 853.0 | $ 131.2 |
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 |  |  |  |  |  |

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