STOCKHOLDERS' EQUITY - Reclassification from Other Comprehensive Income (Loss) to Income (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 25, 2024	Aug. 27, 2023
Interest expense, net	$ (105.8)	$ (106.0)
Equity method investment earnings	29.1	35.5
Income tax expense	(138.9)	98.3
Net Income (Loss)	466.8	319.7
Pension and postretirement non-service income (expense)	(3.1)	0.3
Selling, general and administrative expenses	337.7	334.1
Income tax expense (benefit)	(138.9)	98.3
Net income attributable to Conagra Brands, Inc. common stockholders:	466.8	319.7
Reclassification out of Accumulated Other Comprehensive Income | Gain in accumulated other comprehensive income
Interest expense, net	(0.7)	(0.9)
Equity method investment earnings	(1.2)	(1.1)
Total before tax	(1.9)	(2.0)
Income tax expense	0.5	0.5
Net Income (Loss)	(1.4)	(1.5)
Total before tax	(1.9)	(2.0)
Income tax expense (benefit)	0.5	0.5
Net income attributable to Conagra Brands, Inc. common stockholders:	(1.4)	(1.5)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Pension and postretirement non-service income (expense)	(1.1)	(1.2)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Total before tax	(1.1)	(1.2)
Income tax expense	0.2	0.3
Net Income (Loss)	(0.9)	(0.9)
Total before tax	(1.1)	(1.2)
Income tax expense (benefit)	0.2	0.3
Net income attributable to Conagra Brands, Inc. common stockholders:	(0.9)	$ (0.9)
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