Business Segment and Geographic Information - Schedule of Net Sales by Class of Similar Products (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 23, 2025	Nov. 24, 2024	Nov. 23, 2025	Nov. 24, 2024
Segment Reporting Information [Line Items]
Net sales	$ 4,860.8	$ 5,240.1	$ 9,378.3	$ 10,088.2
Snacks
Segment Reporting Information [Line Items]
Net sales	1,017.9	1,055.0	2,067.6	2,161.8
Cereal
Segment Reporting Information [Line Items]
Net sales	791.2	829.5	1,558.4	1,622.6
Convenient meals
Segment Reporting Information [Line Items]
Net sales	827.0	795.1	1,477.8	1,474.0
Pet
Segment Reporting Information [Line Items]
Net sales	698.7	623.8	1,341.7	1,228.4
Dough
Segment Reporting Information [Line Items]
Net sales	720.9	722.6	1,236.0	1,240.4
Baking mixes and ingredients
Segment Reporting Information [Line Items]
Net sales	556.0	577.2	1,004.0	1,034.3
Super-premium ice cream
Segment Reporting Information [Line Items]
Net sales	175.8	163.6	397.2	376.5
Yogurt
Segment Reporting Information [Line Items]
Net sales	0.0	377.8	102.0	749.7
Other
Segment Reporting Information [Line Items]
Net sales	$ 73.3	$ 95.5	$ 193.6	$ 200.5