Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	May 25, 2025	May 26, 2024	May 28, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 1,156.2	$ 610.2	$ 901.9
Net income, tax (expense) benefit	(3.7)	(262.5)	(218.7)
Net income	1,152.5	347.7	683.2
Unrealized derivative adjustments	(2.9)	8.3	4.2
Unrealized derivative adjustments, tax expense (benefit)	0.8	(2.1)	(1.1)
Unrealized derivative adjustments, after-tax amount	(2.1)	6.2	3.1
Reclassification for derivative adjustments included in net income, pre-tax amount	(6.8)	(8.2)	(4.9)
Reclassification for derivative adjustments included in net income, tax expense (benefit)	1.7	2.0	1.2
Reclassification for derivative adjustments included in net income, after-tax amount	(5.1)	(6.2)	(3.7)
Unrealized currency translation gains (losses)	(18.4)	9.6	(9.8)
Unrealized currency translation gains (losses), after-tax amount	(18.4)	9.6	(9.8)
Reclassification for currency translation losses in connection with the sale of Agro Tech Foods Limited	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	65.1	1.7	(33.2)
Unrealized pension and postretirement benefit obligations, tax (expense) benefit	(15.7)	(0.5)	8.3
Unrealized pension and postretirement benefit obligations, after-tax amount	49.4	1.2	(24.9)
Reclassification for pension and postretirement benefit obligations included in net income	(18.2)	(3.7)	(4.5)
Reclassification for pension and postretirement benefit obligations included in net income, tax (expense) benefit	4.4	0.9	1.3
Reclassification for pension and postretirement benefit obligations included in net income, after-tax amount	(13.8)	(2.8)	(3.2)
Comprehensive income	1,254.8	617.9	853.7
Comprehensive income, tax (expense) benefit	(12.5)	(262.2)	(209.0)
Comprehensive income, after-tax amount	1,242.3	355.7	644.7
Comprehensive income (loss) attributable to noncontrolling interests (see Note 7)	38.1	(0.2)	(5.3)
Comprehensive income (loss) attributable to noncontrolling interests, tax (expense) benefit (see Note 7)		(0.2)	(0.4)
Comprehensive income (loss) attributable to noncontrolling interests, after-tax amount (see Note 7)	38.1	(0.4)	(5.7)
Comprehensive income attributable to Conagra Brands, Inc.	1,216.7	618.1	859.0
Comprehensive income attributable to Conagra Brands, Inc., tax (expense) benefit	(12.5)	(262.0)	(208.6)
Comprehensive income attributable to Conagra Brands, Inc., after-tax amount	$ 1,204.2	$ 356.1	$ 650.4