Business Segment And Geographic Information (Net Sales By Class Of Similar Products) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 24, 2024	Nov. 26, 2023	Nov. 24, 2024	Nov. 26, 2023
Product Information [Line Items]
Net sales	$ 5,240.1	$ 5,139.4	$ 10,088.2	$ 10,044.1
Snacks [Member]
Product Information [Line Items]
Net sales	1,055.0	1,037.3	2,161.8	2,174.0
Cereal [Member]
Product Information [Line Items]
Net sales	829.5	776.9	1,622.6	1,594.8
Convenient meals [Member]
Product Information [Line Items]
Net sales	795.1	785.1	1,474.0	1,450.6
Dough [Member]
Product Information [Line Items]
Net sales	722.6	775.1	1,240.4	1,310.0
Pet [Member]
Product Information [Line Items]
Net sales	623.8	572.3	1,228.4	1,152.2
Baking mixes and ingredients [Member]
Product Information [Line Items]
Net sales	577.2	562.3	1,034.3	1,028.8
Yogurt [Member]
Product Information [Line Items]
Net sales	377.8	364.9	749.7	733.3
Super-premium ice cream [Member]
Product Information [Line Items]
Net sales	163.6	168.3	376.5	392.3
Other [Member]
Product Information [Line Items]
Net sales	$ 95.5	$ 97.2	$ 200.5	$ 208.1