CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 26, 2017	Feb. 28, 2016	Feb. 26, 2017	Feb. 28, 2016
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [ABSTRACT]
Net earnings, including earnings attributable to redeemable and noncontrolling interests	$ 370.2	$ 367.7	$ 1,285.5	$ 1,346.4
Other Comprehensive Income (Loss), Net of Tax:
Foreign currency translation	113.7	(39.9)	88.4	(252.4)
Other fair value changes:
Securities	0.5	(0.2)	0.8	(0.2)
Hedge derivatives	(4.9)	19.0	42.4	29.4
Reclassification to earnings:
Hedge derivatives	(8.7)	(3.7)	(19.3)	(3.3)
Amortization of losses and prior service costs	29.9	31.0	92.3	97.8
Other comprehensive income (loss), net of tax	130.5	6.2	204.6	(128.7)
Total comprehensive income (loss)	500.7	373.9	1,490.1	1,217.7
Comprehensive income (loss) attributable to redeemable and noncontrolling interests	16.4	20.1	(20.3)	4.1
Total comprehensive income (loss) attributable to General Mills	$ 484.3	$ 353.8	$ 1,510.4	$ 1,213.6