STOCKHOLDERS' EQUITY - Reconciliation of Stockholders' Equity Accounts (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Nov. 23, 2025	Aug. 24, 2025	Nov. 24, 2024	Aug. 25, 2024	Nov. 23, 2025	Nov. 24, 2024
STOCKHOLDERS' EQUITY
Balance	$ 8,915.8	$ 8,932.7	$ 8,695.6	$ 8,511.3	$ 8,932.7	$ 8,511.3
Stock option and incentive plans	13.5	0.9	8.8	0.8
Currency translation adjustments	(4.9)	1.1	(19.4)	60.5
Repurchase of common shares	(0.3)	(15.0)				(64.0)
Derivative adjustments	(1.6)	(0.4)	(1.0)	(3.3)
Activities of noncontrolling interests				(108.9)
Pension and postretirement healthcare benefits	(0.7)	(0.3)	(0.8)	0.2
Dividends declared on common stock	(167.4)	(167.7)	(167.0)	(167.8)
Net loss attributable to Conagra Brands, Inc.	(663.6)	164.5	284.5	466.8	(499.1)	751.3
Balance	$ 8,090.8	$ 8,915.8	$ 8,800.7	$ 8,695.6	$ 8,090.8	$ 8,800.7
Common Stock
STOCKHOLDERS' EQUITY
Balance (in shares)	584.2	584.2	584.2	584.2	584.2	584.2
Balance	$ 2,921.2	$ 2,921.2	$ 2,921.2	$ 2,921.2	$ 2,921.2	$ 2,921.2
Balance (in shares)	584.2	584.2	584.2	584.2	584.2	584.2
Balance	$ 2,921.2	$ 2,921.2	$ 2,921.2	$ 2,921.2	$ 2,921.2	$ 2,921.2
Additional Paid-in Capital
STOCKHOLDERS' EQUITY
Balance	2,287.0	2,347.2	2,329.7	2,363.2	2,347.2	2,363.2
Stock option and incentive plans	13.5	(60.2)	7.8	(33.5)
Balance	2,300.5	2,287.0	2,337.5	2,329.7	2,300.5	2,337.5
Retained Earnings
STOCKHOLDERS' EQUITY
Balance	6,755.9	6,759.1	6,574.8	6,276.3	6,759.1	6,276.3
Stock option and incentive plans	(0.6)		(0.3)	(0.5)
Dividends declared on common stock	(167.4)	(167.7)	(167.0)	(167.8)
Net loss attributable to Conagra Brands, Inc.	(663.6)	164.5	284.5	466.8
Balance	5,924.3	6,755.9	6,692.0	6,574.8	5,924.3	6,692.0
Accumulated Other Comprehensive Loss
STOCKHOLDERS' EQUITY
Balance	16.7	16.3	(16.1)	(35.5)	16.3	(35.5)
Currency translation adjustments	(4.9)	1.1	(19.4)	22.5
Derivative adjustments	(1.6)	(0.4)	(1.0)	(3.3)
Pension and postretirement healthcare benefits	(0.7)	(0.3)	(0.8)	0.2
Balance	9.5	16.7	(37.3)	(16.1)	9.5	(37.3)
Treasury Stock
STOCKHOLDERS' EQUITY
Balance	(3,065.0)	(3,111.1)	(3,114.0)	(3,084.8)	(3,111.1)	(3,084.8)
Stock option and incentive plans	0.6	61.1	1.3	34.8
Repurchase of common shares	(0.3)	(15.0)				(64.0)
Balance	$ (3,064.7)	$ (3,065.0)	$ (3,112.7)	(3,114.0)	$ (3,064.7)	(3,112.7)
Noncontrolling Interests
STOCKHOLDERS' EQUITY
Balance				70.9		$ 70.9
Currency translation adjustments				38.0
Activities of noncontrolling interests				$ (108.9)