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