Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 23, 2025	Nov. 24, 2024	Nov. 23, 2025	Nov. 24, 2024
Statement of Comprehensive Income [Abstract]
Net income (loss), pre-tax amount	$ (655.3)	$ 346.0	$ (366.2)	$ 674.0
Net income (loss), tax (expense) benefit	(8.3)	(61.5)	(132.9)	77.4
Net income (loss)	(663.6)	284.5	(499.1)	751.4
Unrealized derivative adjustments, pre-tax amount	(0.8)	0.5	0.2	(2.0)
Unrealized derivative adjustments, tax (expense) benefit	0.2	(0.1)	(0.1)	0.5
Unrealized derivative adjustments, after-tax amount	(0.6)	0.4	0.1	(1.5)
Reclassification for derivative adjustments included in net income (loss), pre-tax amount	(1.4)	(1.8)	(2.8)	(3.7)
Reclassification for derivative adjustments included in net income (loss), tax (expense) benefit	0.4	0.4	0.7	0.9
Reclassification for derivative adjustments included in net income (loss), after-tax amount	(1.0)	(1.4)	(2.1)	(2.8)
Unrealized currency translation gains (losses), pre-tax amount	(4.9)	(19.4)	(3.8)	(38.7)
Unrealized currency translation gains (losses), after-tax amount	(4.9)	(19.4)	(3.8)	(38.7)
Reclassification for currency translation losses in connection with the sale of Agro Tech Foods Limited, pre-tax amount				79.8
Reclassification for currency translation losses in connection with the sale of Agro Tech Foods Limited, after-tax amount				79.8
Unrealized pension and postretirement benefit obligations, pre-tax amount			0.4	1.3
Unrealized pension and postretirement benefit obligations, tax (expense) benefit				(0.2)
Unrealized pension and postretirement benefit obligations, after-tax amount			0.4	1.1
Reclassification for pension and postretirement benefit obligations included in net income (loss), pre-tax amount	(1.0)	(1.2)	(1.9)	(2.3)
Reclassification for pension and postretirement benefit obligations included in net income (loss), tax (expense) benefit	0.3	0.4	0.5	0.6
Reclassification for pension and postretirement benefit obligations included in net income (loss), after-tax amount	(0.7)	(0.8)	(1.4)	(1.7)
Comprehensive income (loss), pre-tax amount			(374.1)	708.4
Comprehensive income (loss), tax (expense) benefit			(131.8)	79.2
Comprehensive income (loss), after-tax amount			(505.9)	787.6
Comprehensive income (loss) attributable to noncontrolling interests, pre-tax amount (see Note 3)				38.1
Comprehensive income (loss) attributable to noncontrolling interests, after-tax amount (see Note 3)				38.1
Comprehensive income (loss) attributable to Conagra Brands, Inc., pre-tax amount	(663.4)	324.1	(374.1)	670.3
Comprehensive income (loss) attributable to Conagra Brands, Inc., tax (expense) benefit	(7.4)	(60.8)	(131.8)	79.2
Comprehensive income (loss) attributable to Conagra Brands, Inc., after-tax amount	$ (670.8)	$ 263.3	$ (505.9)	$ 749.5