Business Segment and Geographic Information - Schedule of Operating Segment Results (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 22, 2026	Feb. 23, 2025	Feb. 22, 2026	Feb. 23, 2025
Segment Reporting Information [Line Items]
Net sales	$ 4,436.7	$ 4,842.2	$ 13,815.0	$ 14,930.4
Cost of sales	3,069.8	3,203.1	9,222.8	9,671.4
Selling, general, and administrative expenses	812.9	844.4	2,500.4	2,551.5
Operating profit	524.6	891.4	2,978.4	2,800.8
Divestitures loss (gain), net	5.0	(95.9)	(1,049.4)	(95.9)
Restructuring, transformation, impairment, and other exit costs (recoveries)	24.4	(0.8)	162.8	2.6
Operating Segments
Segment Reporting Information [Line Items]
Net sales	4,429.6	4,839.4	13,796.4	14,923.2
Operating profit	628.8	850.6	2,380.8	2,952.0
Corporate and Joint Ventures
Segment Reporting Information [Line Items]
Net sales	7.1	2.8	18.6	7.2
Operating profit	74.8	55.9	289.0	244.5
North America Retail | Operating Segments
Segment Reporting Information [Line Items]
Net sales	2,596.4	3,009.1	8,105.2	9,347.2
Cost of sales	1,758.9	1,926.5	5,218.1	5,786.8
Selling, general, and administrative expenses	401.4	434.5	1,204.5	1,304.3
Operating profit	436.1	648.1	1,682.6	2,256.1
North America Retail | Operating Segments | U.S. Meals & Baking Solutions
Segment Reporting Information [Line Items]
Net sales	1,091.8	1,130.4	3,326.0	3,404.6
North America Retail | Operating Segments | Big G Cereal & Canada
Segment Reporting Information [Line Items]
Net sales	743.4	1,060.7	2,389.8	3,371.0
North America Retail | Operating Segments | U.S. Snacks
Segment Reporting Information [Line Items]
Net sales	761.2	818.0	2,389.4	2,571.6
International | Operating Segments
Segment Reporting Information [Line Items]
Net sales	696.3	651.3	2,185.4	2,058.9
Cost of sales	526.7	493.6	1,606.8	1,562.4
Selling, general, and administrative expenses	136.0	139.7	450.9	433.8
Operating profit	33.6	18.0	127.7	62.7
North America Pet | Operating Segments
Segment Reporting Information [Line Items]
Net sales	640.5	623.7	1,910.9	1,795.6
Cost of sales	400.9	386.3	1,163.7	1,066.0
Selling, general, and administrative expenses	136.8	135.2	408.4	368.7
Operating profit	102.8	102.2	338.8	360.9
North America Foodservice | Operating Segments
Segment Reporting Information [Line Items]
Net sales	496.4	555.3	1,594.9	1,721.5
Cost of sales	397.9	430.7	1,233.7	1,318.4
Selling, general, and administrative expenses	42.2	42.3	129.5	130.8
Operating profit	$ 56.3	$ 82.3	$ 231.7	$ 272.3