Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 23, 2025	Feb. 25, 2024	Feb. 23, 2025	Feb. 25, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 189.0	$ 404.7	$ 863.0	$ 1,212.0
Net income, tax (expense) benefit	(43.9)	(95.9)	33.5	(297.1)
Net income	145.1	308.8	896.5	914.9
Unrealized derivative adjustments	1.2	(3.3)	(0.8)	4.0
Unrealized derivative adjustments, tax expense (benefit)	(0.3)	0.8	0.2	(1.0)
Unrealized derivative adjustments, after-tax amount	0.9	(2.5)	(0.6)	3.0
Reclassification for derivative adjustments included in net income, pre-tax amount	(1.6)	(2.1)	(5.3)	(6.2)
Reclassification for derivative adjustments included in net income, tax expense (benefit)	0.4	0.5	1.3	1.5
Reclassification for derivative adjustments included in net income, after-tax amount	(1.2)	(1.6)	(4.0)	(4.7)
Unrealized currency translation losses	(4.4)	4.8	(43.1)	9.1
Unrealized currency translation losses, after-tax amount	(4.4)	4.8	(43.1)	9.1
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		(7.3)	1.3	(7.2)
Unrealized pension and postretirement benefit obligations, tax (expense) benefit		1.8	(0.2)	1.7
Unrealized pension and postretirement benefit obligations, after-tax amount		(5.5)	1.1	(5.5)
Reclassification for pension and postretirement benefit obligations included in net income	(1.2)	(0.1)	(3.5)	(2.5)
Reclassification for pension and postretirement benefit obligations included in net income, tax (expense) benefit	0.3		0.9	0.6
Reclassification for pension and postretirement benefit obligations included in net income, after-tax amount	(0.9)	(0.1)	(2.6)	(1.9)
Comprehensive income	183.0	396.7	891.4	1,209.2
Comprehensive income, tax (expense) benefit	(43.5)	(92.8)	35.7	(294.3)
Comprehensive income, after-tax amount	139.5	303.9	927.1	914.9
Comprehensive income (loss) attributable to noncontrolling interests		0.5	38.1
Comprehensive income (loss) attributable to noncontrolling interests, tax (expense) benefit		(0.1)		(0.2)
Comprehensive income (loss) attributable to noncontrolling interests, after-tax amount		0.4	38.1	(0.2)
Comprehensive income attributable to Conagra Brands, Inc.	183.0	396.2	853.3	1,209.2
Comprehensive income attributable to Conagra Brands, Inc., tax (expense) benefit	(43.5)	(92.7)	35.7	(294.1)
Comprehensive income attributable to Conagra Brands, Inc., after-tax amount	$ 139.5	$ 303.5	$ 889.0	$ 915.1