Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	May 30, 2021	May 31, 2020	May 26, 2019
Net income
Pre-Tax Amount	$ 1,494.7	$ 1,043.1	$ 900.0
Tax (Expense) Benefit	(193.8)	(201.3)	(221.6)
After-Tax Amount	1,300.9	841.8	678.4
Unrealized derivative adjustments
Pre-Tax Amount	0.4	(7.1)	45.5
Tax (Expense) Benefit	(1.8)	1.8	(11.4)
After-Tax Amount	(1.4)	(5.3)	34.1
Reclassification for derivative adjustments included in net income
Pre-Tax Amount	(1.6)	(3.3)	(1.9)
Tax (Expense) Benefit	1.0	0.9	0.5
After-Tax Amount	(0.6)	(2.4)	(1.4)
Unrealized currency translation gains (losses)
Pre-Tax Amount	53.3	(42.7)	(10.2)
Tax (Expense) Benefit	(1.5)	1.4	0.0
After-Tax Amount	51.8	(41.3)	(10.2)
Reclassification for currency translation losses included in net income
Pre-Tax Amount	0.0	0.0	10.4
Tax (Expense) Benefit	0.0	0.0	0.0
After-Tax Amount	0.0	0.0	10.4
Unrealized pension and postretirement benefit obligations
Pre-Tax Amount	95.1	63.2	(43.8)
Tax (Expense) Benefit	(23.6)	(15.9)	10.9
After-Tax Amount	71.5	47.3	(32.9)
Reclassification for pension and postretirement benefit obligations included in net income
Pre-Tax Amount	(3.6)	(5.5)	(1.5)
Tax (Expense) Benefit	0.9	1.4	0.4
After-Tax Amount	(2.7)	(4.1)	(1.1)
Comprehensive income
Pre-Tax Amount	1,638.3	1,047.7	898.5
Tax (Expense) Benefit	(218.8)	(211.7)	(221.2)
After-Tax Amount	1,419.5	836.0	677.3
Comprehensive income (loss) attributable to noncontrolling interests
Pre-Tax Amount	6.1	(3.9)	(1.7)
Tax (Expense) Benefit	(0.8)	(0.9)	(0.1)
After-Tax Amount	5.3	(4.8)	(1.8)
Comprehensive income attributable to Conagra Brands, Inc.
Pre-Tax Amount	1,632.2	1,051.6	900.2
Tax (Expense) Benefit	(218.0)	(210.8)	(221.1)
After-Tax Amount	$ 1,414.2	$ 840.8	$ 679.1