Business Segment and Geographic Information (Net Sales by Class of Similar Products) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	May 25, 2025	Feb. 23, 2025	Nov. 24, 2024	Aug. 25, 2024	May 26, 2024	Feb. 25, 2024	Nov. 26, 2023	Aug. 27, 2023	May 25, 2025	May 26, 2024	May 28, 2023
Product Information [Line Items]
Net sales	$ 4,556.2	$ 4,842.2	$ 5,240.1	$ 4,848.1	$ 4,713.9	$ 5,099.2	$ 5,139.4	$ 4,904.7	$ 19,486.6	$ 19,857.2	$ 20,094.2
Snacks [Member]
Product Information [Line Items]
Net sales									4,187.4	4,327.3	4,431.5
Convenient meals [Member]
Product Information [Line Items]
Net sales									2,816.1	2,906.5	2,961.6
Cereal [Member]
Product Information [Line Items]
Net sales									3,078.6	3,187.5	3,209.5
Yogurt [Member]
Product Information [Line Items]
Net sales									1,391.6	1,482.5	1,472.9
Pet [Member]
Product Information [Line Items]
Net sales									2,585.8	2,382.7	2,476.0
Dough [Member]
Product Information [Line Items]
Net sales									2,384.2	2,423.6	2,390.5
Baking mixes and ingredients [Member]
Product Information [Line Items]
Net sales									1,940.2	1,996.0	2,037.3
Super-premium ice cream [Member]
Product Information [Line Items]
Net sales									721.6	728.7	703.7
Other [Member]
Product Information [Line Items]
Net sales									$ 381.1	$ 422.4	$ 411.2