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BUSINESS SEGMENTS AND RELATED INFORMATION (Net Sales by Product) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May. 31, 2015 | Feb. 22, 2015 | Nov. 23, 2014 | Aug. 24, 2014 | May. 25, 2014 | Feb. 23, 2014 | Nov. 24, 2013 | Aug. 25, 2013 | May. 31, 2015 | May. 25, 2014 | May. 26, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 4,104.7 | $ 3,876.7 | $ 4,150.0 | $ 3,701.0 | $ 3,959.4 | $ 3,947.3 | $ 4,221.1 | $ 3,715.8 | $ 15,832.4 | $ 15,843.6 | $ 13,469.3
Consumer Foods |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,304.4 | 7,315.7 | 7,551.4
Consumer Foods | Grocery |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,911.1 | 3,897.0 | 4,093.4
Consumer Foods | Frozen |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,261.9 | 2,241.9 | 2,295.5
Consumer Foods | International |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,026.1 | 1,061.4 | 1,073.7
Consumer Foods | Other Brands |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 105.3 | 115.4 | 88.8
Commercial Foods |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 4,463.2 | 4,332.2 | 4,109.7
Commercial Foods | Specialty Potatoes |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,892.4 | 2,792.7 | 2,753.1
Commercial Foods | Foodservice |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,570.8 | 1,539.5 | 1,356.6
Private Brands |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 4,064.8 | 4,195.7 | 1,808.2
Private Brands | Snacks |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,340.3 | 1,373.2 | 542.0
Private Brands | Retail Bakery |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 719.4 | 772.5 | 234.6
Private Brands | Bars and Coordinated |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 724.9 | 679.5 | 535.2
Private Brands | Pasta |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 532.6 | 564.3 | 192.9
Private Brands | Cereal |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 475.2 | 496.7 | 191.6
Private Brands | Condiments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 272.4 | $ 309.5 | $ 111.9

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