STOCKHOLDERS' EQUITY - Reconciliation of Stockholders' Equity Accounts (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Feb. 23, 2025	Nov. 24, 2024	Aug. 25, 2024	Feb. 25, 2024	Nov. 26, 2023	Aug. 27, 2023	Feb. 23, 2025	Feb. 25, 2024
Balance	$ 8,800.7	$ 8,695.6	$ 8,511.3	$ 9,074.2	$ 8,955.1	$ 8,807.3	$ 8,511.3	$ 8,807.3
Stock option and incentive plans	6.0	8.8	0.8	14.8	6.6	(16.2)
Currency translation adjustments	(4.4)	(19.4)	60.5	4.8	(6.3)	10.6
Derivative adjustments	(0.3)	(1.0)	(3.3)	(4.1)	0.8	1.6
Activities of noncontrolling interests			(108.9)	0.2		0.2
Pension and postretirement healthcare benefits	(0.9)	(0.8)	0.2	(5.6)	(1.0)	(0.8)
Dividends declared on common stock	(167.1)	(167.0)	(167.8)	(167.4)	(167.2)	(167.3)
Net income attributable to Conagra Brands, Inc. common stockholders:	145.1	284.5	466.8	308.6	286.2	319.7	896.4	914.5
Repurchase of common shares			(64.0)
Balance	$ 8,779.1	$ 8,800.7	$ 8,695.6	$ 9,225.5	$ 9,074.2	$ 8,955.1	$ 8,779.1	$ 9,225.5
Common Stock
Balance (in shares)	584.2	584.2	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	$ 2,921.2	$ 2,921.2
Balance (in shares)	584.2	584.2	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	$ 2,921.2	$ 2,921.2
Additional Paid-in Capital
Balance	2,337.5	2,329.7	2,363.2	2,339.6	2,334.0	2,376.9	2,363.2	2,376.9
Stock option and incentive plans	4.8	7.8	(33.5)	14.1	5.6	(42.9)
Balance	2,342.3	2,337.5	2,329.7	2,353.7	2,339.6	2,334.0	2,342.3	2,353.7
Retained Earnings
Balance	6,692.0	6,574.8	6,276.3	6,871.5	6,752.9	6,599.4	6,276.3	6,599.4
Stock option and incentive plans	(0.1)	(0.3)	(0.5)	(1.0)	(0.4)	1.1
Dividends declared on common stock	(167.1)	(167.0)	(167.8)	(167.4)	(167.2)	(167.3)
Net income attributable to Conagra Brands, Inc. common stockholders:	145.1	284.5	466.8	308.6	286.2	319.7
Balance	6,669.9	6,692.0	6,574.8	7,011.7	6,871.5	6,752.9	6,669.9	7,011.7
Accumulated Other Comprehensive Loss
Balance	(37.3)	(16.1)	(35.5)	(38.7)	(32.9)	(44.4)	(35.5)	(44.4)
Currency translation adjustments	(4.4)	(19.4)	22.5	4.6	(5.6)	10.7
Derivative adjustments	(0.3)	(1.0)	(3.3)	(4.1)	0.8	1.6
Pension and postretirement healthcare benefits	(0.9)	(0.8)	0.2	(5.6)	(1.0)	(0.8)
Balance	(42.9)	(37.3)	(16.1)	(43.8)	(38.7)	(32.9)	(42.9)	(43.8)
Treasury Stock
Balance	(3,112.7)	(3,114.0)	(3,084.8)	(3,089.6)	(3,090.7)	(3,116.3)	(3,084.8)	(3,116.3)
Stock option and incentive plans	1.3	1.3	34.8	1.7	1.1	25.6
Repurchase of common shares			(64.0)
Balance	$ (3,111.4)	$ (3,112.7)	(3,114.0)	(3,087.9)	(3,089.6)	(3,090.7)	(3,111.4)	(3,087.9)
Noncontrolling Interests
Balance			70.9	70.2	70.6	70.5	$ 70.9	70.5
Stock option and incentive plans					0.3
Currency translation adjustments			38.0	0.2	(0.7)	(0.1)
Activities of noncontrolling interests			$ (108.9)	0.2		0.2
Balance				$ 70.6	$ 70.2	$ 70.6		$ 70.6