Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 23, 2020	Feb. 28, 2021	Feb. 23, 2020
CONSOLIDATED STATEMENTS OF EARNINGS [ABSTRACT]
Net sales	$ 4,520.0	$ 4,180.3	$ 13,603.4	$ 12,603.6
Cost of sales	2,966.1	2,777.1	8,738.0	8,241.8
Selling, general, and administrative expenses	716.3	746.6	2,256.6	2,224.5
Restructuring, impairment, and other exit costs	11.0	5.8	11.9	12.9
Operating profit	826.6	650.8	2,596.9	2,124.4
Benefit plan non-service income	(33.4)	(30.3)	(99.6)	(90.7)
Interest, net	106.0	109.8	317.7	347.9
Earnings before income taxes and after-tax earnings from joint ventures	754.0	571.3	2,378.8	1,867.2
Income taxes	162.0	118.2	522.2	340.9
After-tax earnings from joint ventures	11.8	10.8	89.5	57.5
Net earnings, including earnings attributable to redeemable and noncontrolling interests	603.8	463.9	1,946.1	1,583.8
Net earnings attributable to redeemable and noncontrolling interests	8.1	9.8	23.1	28.3
Net earnings attributable to General Mills	$ 595.7	$ 454.1	$ 1,923.0	$ 1,555.5
Earnings per share - basic	$ 0.97	$ 0.75	$ 3.13	$ 2.56
Earnings per share - diluted	$ 0.96	$ 0.74	$ 3.10	$ 2.54