STOCKHOLDERS' EQUITY - Reclassification from Other Comprehensive Income (Loss) to Income (Details) - USD ($) $ 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
Interest expense, net	$ (100.9)			$ (106.5)			$ (314.9)	$ (325.8)
Equity method investment earnings	47.4			41.2			125.0	131.0
Income tax expense	43.9			95.9			(33.5)	297.1
Net Income (Loss)	145.1	$ 284.5	$ 466.8	308.6	$ 286.2	$ 319.7	896.4	914.5
Pension and postretirement non-service income (expense)	(3.1)			1.4			(9.3)	2.1
Selling, general and administrative expenses	443.7			387.4			1,204.3	1,085.4
Income tax expense (benefit)	43.9			95.9			(33.5)	297.1
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
Reclassification out of Accumulated Other Comprehensive Income | Gain in accumulated other comprehensive income
Interest expense, net	(0.7)			(0.9)			(2.0)	(2.7)
Equity method investment earnings	(0.9)			(1.2)			(3.3)	(3.5)
Total before tax	(1.6)			(2.1)			(5.3)	(6.2)
Income tax expense	0.4			0.5			1.3	1.5
Net Income (Loss)	(1.2)			(1.6)			(4.0)	(4.7)
Total before tax	(1.6)			(2.1)			(5.3)	(6.2)
Income tax expense (benefit)	0.4			0.5			1.3	1.5
Net income attributable to Conagra Brands, Inc. common stockholders:	(1.2)			(1.6)			(4.0)	(4.7)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Settlement Gain (Loss) Attributable to Parent
Pension and postretirement non-service income (expense)				1.1				1.1
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent
Pension and postretirement non-service income (expense)	(0.1)						(0.1)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Total before tax							(3.5)	(2.5)
Income tax expense							0.9	0.6
Net Income (Loss)							(2.6)	(1.9)
Pension and postretirement non-service income (expense)	(1.1)			(1.2)			(3.4)	(3.6)
Total before tax							(3.5)	(2.5)
Income tax expense (benefit)							0.9	0.6
Net income attributable to Conagra Brands, Inc. common stockholders:							(2.6)	$ (1.9)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Total before tax	(1.2)			(0.1)
Income tax expense	0.3
Net Income (Loss)	(0.9)			(0.1)
Total before tax	(1.2)			(0.1)
Income tax expense (benefit)	0.3
Net income attributable to Conagra Brands, Inc. common stockholders:	$ (0.9)			$ (0.1)
Reclassification out of Accumulated Other Comprehensive Income | Currency translation losses, net of reclassification adjustments
Total before tax							41.8
Net Income (Loss)							41.8
Selling, general and administrative expenses							41.8
Total before tax							41.8
Net income attributable to Conagra Brands, Inc. common stockholders:							$ 41.8