STOCKHOLDERS' EQUITY - Reconciliation of Stockholders' Equity Accounts (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Aug. 24, 2025	Aug. 25, 2024
Balance	$ 8,932.7	$ 8,511.3
Stock option and incentive plans	0.9	0.8
Currency translation adjustments	1.1	60.5
Repurchase of common shares	(15.0)	(64.0)
Derivative adjustments	(0.4)	(3.3)
Activities of noncontrolling interests		(108.9)
Pension and postretirement healthcare benefits	(0.3)	0.2
Dividends declared on common stock	(167.7)	(167.8)
Net income attributable to Conagra Brands, Inc.	164.5	466.8
Balance	$ 8,915.8	$ 8,695.6
Common Stock
Balance (in shares)	584.2	584.2
Balance	$ 2,921.2	$ 2,921.2
Balance (in shares)	584.2	584.2
Balance	$ 2,921.2	$ 2,921.2
Additional Paid-in Capital
Balance	2,347.2	2,363.2
Stock option and incentive plans	(60.2)	(33.5)
Balance	2,287.0	2,329.7
Retained Earnings
Balance	6,759.1	6,276.3
Stock option and incentive plans		(0.5)
Dividends declared on common stock	(167.7)	(167.8)
Net income attributable to Conagra Brands, Inc.	164.5	466.8
Balance	6,755.9	6,574.8
Accumulated Other Comprehensive Loss
Balance	16.3	(35.5)
Currency translation adjustments	1.1	22.5
Derivative adjustments	(0.4)	(3.3)
Pension and postretirement healthcare benefits	(0.3)	0.2
Balance	16.7	(16.1)
Treasury Stock
Balance	(3,111.1)	(3,084.8)
Stock option and incentive plans	61.1	34.8
Repurchase of common shares	(15.0)	(64.0)
Balance	$ (3,065.0)	(3,114.0)
Noncontrolling Interests
Balance		70.9
Currency translation adjustments		38.0
Activities of noncontrolling interests		$ (108.9)