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ACQUISITIONS (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May. 31, 2015 | Jul. 31, 2014 | Sep. 30, 2013 | Jan. 31, 2013 | Aug. 31, 2012 | May. 31, 2015 | May. 25, 2014 | May. 26, 2013
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |
Purchase price allocated to goodwill | $ 6,300.3 |  |  |  |  | $ 6,300.3 | $ 7,828.5 | $ 8,418.7
Consideration paid for the merger |  |  |  |  |  | 95.7 | 39.9 | 5,018.8
Conagra Foods |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |
Business acquisition transaction related expenses |  |  |  | $ 71.4 |  |  |  |
Business acquisition non recurring expense |  |  |  | 16.7 |  |  |  |
Ralcorp |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |
Business acquisition transaction related expenses |  |  |  | 84.4 |  |  |  |
Private Brands |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |
Purchase price allocated to goodwill | 1,669.5 |  |  |  |  | 1,669.5 | 3,214.6 | 3,793.2
Consumer Foods |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |
Purchase price allocated to goodwill | 3,743.1 |  |  |  |  | 3,743.1 | 3,748.5 | 3,760.5
Commercial Foods |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |
Purchase price allocated to goodwill | 887.7 |  |  |  |  | 887.7 | $ 865.4 | $ 865.0
Blake's All Natural Foods |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |
Payments to acquire a business | 20.7 |  |  |  |  |  |  |
Purchase price allocated to goodwill | $ 20.0 |  |  |  |  | $ 20.0 |  |
TaiMei Potato Industry Limited |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |
Payments to acquire a business |  | $ 92.2 |  |  |  |  |  |
Purchase price allocated to goodwill |  | 23.8 |  |  |  |  |  |
Consideration paid for the merger |  | 74.9 |  |  |  |  |  |
Brands, trademarks and other intangibles |  | $ 3.3 |  |  |  |  |  |
Harlan Bakeries |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |
Payments to acquire a business |  |  | $ 39.9 |  |  |  |  |
Ralcorp |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |
Purchase price allocated to goodwill |  |  |  | 4,380.0 |  |  |  |
Consideration paid for the merger |  |  |  | 4,750.0 |  |  |  |
Brands, trademarks and other intangibles |  |  |  | 2,170.0 |  |  |  |
Purchase price allocated to brands, trademarks and other intangibles |  |  |  | 2,030.0 |  |  |  |
Intangibles |  |  |  | 134.1 |  |  |  |
Deductible for tax purposes |  |  |  | 397.0 |  |  |  |
Ralcorp | Private Brands |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |
Purchase price allocated to goodwill |  |  |  | 3,520.0 |  |  |  |
Ralcorp | Consumer Foods |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |
Purchase price allocated to goodwill |  |  |  | 512.0 |  |  |  |
Ralcorp | Commercial Foods |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |
Purchase price allocated to goodwill |  |  |  | $ 350.6 |  |  |  |
P F Changs And Bertolli Brands Frozen Meal Business |  |  |  |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |  |  |  |
Payments to acquire a business |  |  |  |  | $ 266.9 |  |  |
Purchase price allocated to goodwill |  |  |  |  | 100.1 |  |  |
Brands, trademarks and other intangibles |  |  |  |  | $ 91.8 |  |  |

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