Business Segment Information (Schedule of net sales by class of similar products) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	May 29, 2016	Feb. 28, 2016	Nov. 29, 2015	Aug. 30, 2015	May 31, 2015	Feb. 22, 2015	Nov. 23, 2014	Aug. 24, 2014	May 29, 2016	May 31, 2015	May 25, 2014
Product Information [Line Items]
Net sales	$ 3,927.9	$ 4,002.4	$ 4,424.9	$ 4,207.9	$ 4,298.8	$ 4,350.9	$ 4,712.2	$ 4,268.4	$ 16,563.1	$ 17,630.3	$ 17,909.6
Snacks [Member]
Product Information [Line Items]
Net sales									3,297.2	3,392.0	3,232.5
Convenient Meals [Member]
Product Information [Line Items]
Net sales									2,779.0	2,810.3	2,844.2
Yogurt [Member]
Product Information [Line Items]
Net sales									2,760.9	2,938.3	2,964.7
Cereal [Member]
Product Information [Line Items]
Net sales									2,731.5	2,771.3	2,860.1
Dough [Member]
Product Information [Line Items]
Net sales									1,820.0	1,877.0	1,890.2
Baking Mixes and Ingredients [Member]
Product Information [Line Items]
Net sales									1,704.3	1,867.7	1,996.4
Super-premium Ice Cream [Member]
Product Information [Line Items]
Net sales									731.2	769.5	756.6
Vegetables [Member]
Product Information [Line Items]
Net sales									532.3	937.3	1,014.7
Other Products [Member]
Product Information [Line Items]
Net sales									$ 206.7	$ 266.9	$ 350.2