Consolidated Statements of Common Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock, Common [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at May. 29, 2022	584.2
Balance at May. 29, 2022	$ 2,921.2	$ 2,324.6	$ 6,550.7	$ (11.2)	$ (2,997.6)	$ 74.5	$ 8,862.2
Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture		52.3	(3.7)		31.3	2.1	82.0
Currency translation adjustments				(4.6)		(5.2)	(9.8)
Repurchase of common shares					(150.0)		(150.0)
Derivative adjustments				(0.6)			(0.6)
Activities of noncontrolling interests						(0.8)	(0.8)
Pension and postretirement healthcare benefits				(28.0)		(0.1)	(28.1)
Dividends declared on common stock			(631.2)				(631.2)
Net income attributable to Conagra Brands, Inc.			683.6				683.6
Balance (in shares) at May. 28, 2023	584.2
Balance at May. 28, 2023	$ 2,921.2	2,376.9	6,599.4	(44.4)	(3,116.3)	70.5	8,807.3
Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture		(13.7)	(1.1)		31.5	1.2	17.9
Currency translation adjustments				10.5		(0.9)	9.6
Activities of noncontrolling interests						0.1	0.1
Pension and postretirement healthcare benefits				(1.6)			(1.6)
Dividends declared on common stock			(669.2)				(669.2)
Net income attributable to Conagra Brands, Inc.			347.2				347.2
Balance (in shares) at May. 26, 2024	584.2
Balance at May. 26, 2024	$ 2,921.2	2,363.2	6,276.3	(35.5)	(3,084.8)	70.9	8,511.3
Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture		(16.0)	(0.6)		37.7		21.1
Currency translation adjustments				23.4		38.0	61.4
Repurchase of common shares					(64.0)		(64.0)
Derivative adjustments				(7.2)			(7.2)
Activities of noncontrolling interests						$ (108.9)	(108.9)
Pension and postretirement healthcare benefits				35.6			35.6
Dividends declared on common stock			(669.0)				(669.0)
Net income attributable to Conagra Brands, Inc.			1,152.4				1,152.4
Balance (in shares) at May. 25, 2025	584.2
Balance at May. 25, 2025	$ 2,921.2	$ 2,347.2	$ 6,759.1	$ 16.3	$ (3,111.1)		$ 8,932.7