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GOODWILL AND OTHER IDENTIFIABLE INTANGIBLE ASSETS (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May. 31, 2015 USD ($) | May. 31, 2015 USD ($) reporting_unit | May. 25, 2014 USD ($) brand | May. 26, 2013 USD ($)
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate |  | 8.00% |  |
Fair Value Inputs, Long-term Revenue Growth Rate |  | 3.00% |  |
Impairment |  | $ 1,527.9 | $ 602.2 |
Goodwill | $ 6,300.3 | 6,300.3 | 7,828.5 | $ 8,418.7
Noncurrent assets held for sale | 0.0 | 0.0 | 198.9 |
Long-lived asset impairment charge |  | $ (627.3) | (116.6) | 0.0
Weighted average life in years of amortizing intangible assets |  | 21 years |  |
Recognized amortization expense |  | $ 108.5 | 111.4 | 55.7
Average amortization expense | 107.9 | 107.9 |  |
Amortization expense year one | 109.0 | 109.0 |  |
Amortization expense year five | 106.1 | 106.1 |  |
Retail Bakery |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Impairment | 174.4 |  | 55.4 |
Goodwill | 535.5 | 535.5 |  |
Condiments |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Impairment |  | 136.1 |  |
Pasta |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Impairment | 157.1 |  | 94.2 |
Goodwill | 588.2 | 588.2 |  |
Snacks |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Impairment | 536.5 |  | 231.6 |
Goodwill | 276.5 | $ 276.5 |  |
Private Brands |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Number of reporting units | reporting_unit |  | 6 |  |
Impairment | 1,530.0 | $ 1,527.9 | 602.2 |
Number of reporting units with fair value substantially less than carrying value | reporting_unit |  | 4 |  |
Goodwill | 1,669.5 | $ 1,669.5 | 3,214.6 | 3,793.2
Impairment of Intangible Assets (Excluding Goodwill) |  | 43.7 | $ 3.2 |
Number of brands impaired | brand |  |  | 2 |
Private Brands | Goodwill |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Noncurrent assets held for sale | 17.5 | 17.5 |  |
Long-lived asset impairment charge |  | 17.5 |  |
Private Brands | Amortizing Intangible Assets |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Noncurrent assets held for sale | 14.4 | 14.4 |  |
Long-lived asset impairment charge |  | 7.9 |  |
Consumer Foods |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Impairment |  | 0.0 | $ 0.0 |
Goodwill | 3,743.1 | 3,743.1 | 3,748.5 | 3,760.5
Impairment of Intangible Assets (Excluding Goodwill) |  | 4.8 | 72.5 |
Commercial Foods |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Impairment |  | 0.0 | 0.0 |
Goodwill | 887.7 | 887.7 | 865.4 | $ 865.0
Impairment of Intangible Assets (Excluding Goodwill) |  | 0.3 |  |
Cereal |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Impairment | 195.1 |  | 154.6 |
Goodwill | 269.3 | $ 269.3 |  |
Corporate |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) |  |  | 3.2 |
Bars and Coordinated |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Impairment | $ 328.7 |  | $ 66.4 |

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