Business Segment Information (Schedule of net sales by class of similar products) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	May 26, 2013	Feb. 24, 2013	Nov. 25, 2012	Aug. 26, 2012	May 27, 2012	Feb. 26, 2012	Nov. 27, 2011	Aug. 28, 2011	May 26, 2013	May 27, 2012	May 29, 2011
Product Information [Line Items]
Net sales	$ 4,410.7	$ 4,430.6	$ 4,881.8	$ 4,051.0	$ 4,066.4	$ 4,120.1	$ 4,623.8	$ 3,847.6	$ 17,774.1	$ 16,657.9	$ 14,880.2
Snacks [Member]
Product Information [Line Items]
Net sales									3,024.0	2,649.6	2,371.9
Yogurt [Member]
Product Information [Line Items]
Net sales									2,908.4	2,595.7	1,625.1
Cereal [Member]
Product Information [Line Items]
Net sales									2,889.2	2,935.2	2,812.6
Convenient Meals [Member]
Product Information [Line Items]
Net sales									2,802.9	2,611.8	2,437.6
Baking Mixes and Ingredients [Member]
Product Information [Line Items]
Net sales									1,999.5	1,902.9	1,789.7
Dough [Member]
Product Information [Line Items]
Net sales									1,944.7	1,925.5	1,895.4
Vegetables [Member]
Product Information [Line Items]
Net sales									1,089.5	1,082.5	1,095.6
Super-premium Ice Cream [Member]
Product Information [Line Items]
Net sales									717.1	664.6	563.7
Other Products [Member]
Product Information [Line Items]
Net sales									$ 398.8	$ 290.1	$ 288.6