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BUSINESS SEGMENTS AND RELATED INFORMATION (Net Derivative Gains (Losses)) (Details) - USD ($) $ in Millions | 12 Months Ended
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May. 31, 2015 | May. 25, 2014 | May. 26, 2013
Segment Reporting Information [Line Items] |  |  |
Net derivative gains (losses) incurred | $ (23.7) |  |
Consumer Foods |  |  |
Segment Reporting Information [Line Items] |  |  |
Net derivative gains (losses) incurred | (18.9) |  |
Commercial Foods |  |  |
Segment Reporting Information [Line Items] |  |  |
Net derivative gains (losses) incurred | (1.4) |  |
Private Brands |  |  |
Segment Reporting Information [Line Items] |  |  |
Net derivative gains (losses) incurred | (5.2) |  |
Commodity contracts |  |  |
Segment Reporting Information [Line Items] |  |  |
Net derivative gains (losses) incurred | (108.5) | $ 24.4 | $ 73.1
Commodity contracts | General corporate expenses |  |  |
Segment Reporting Information [Line Items] |  |  |
Net derivative gains (losses) incurred | (50.2) | 36.8 | 49.0
Commodity contracts | Reporting segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net derivative gains (losses) incurred | (58.3) | (12.4) | 24.1
Commodity contracts | Consumer Foods |  |  |
Segment Reporting Information [Line Items] |  |  |
Net derivative gains (losses) incurred | (41.9) | (5.9) | 26.7
Commodity contracts | Commercial Foods |  |  |
Segment Reporting Information [Line Items] |  |  |
Net derivative gains (losses) incurred | (4.7) | 4.3 | (3.6)
Commodity contracts | Private Brands |  |  |
Segment Reporting Information [Line Items] |  |  |
Net derivative gains (losses) incurred | $ (11.7) | $ (10.8) | $ 1.0

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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