Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 26, 2019	May 27, 2018
Net income
Pre-Tax Amount	$ 1,043.1	$ 900.0	$ 972.3
Tax (Expense) Benefit	(201.3)	(221.6)	(160.5)
After-Tax Amount	841.8	678.4	811.8
Unrealized derivative adjustments
Pre-Tax Amount	(7.1)	45.5	2.9
Tax (Expense) Benefit	1.8	(11.4)	(0.9)
After-Tax Amount	(5.3)	34.1	2.0
Reclassification for derivative adjustments included in net income
Pre-Tax Amount	(3.3)	(1.9)	0.1
Tax (Expense) Benefit	0.9	0.5	0.0
After-Tax Amount	(2.4)	(1.4)	0.1
Unrealized gains on available-for-sale securities
Pre-Tax Amount	0.0	0.0	1.1
Tax (Expense) Benefit	0.0	0.0	(0.3)
After-Tax Amount	0.0	0.0	0.8
Unrealized currency translation gains (losses)
Pre-Tax Amount	(42.7)	(10.2)	0.8
Tax (Expense) Benefit	1.4	0.0	(0.1)
After-Tax Amount	(41.3)	(10.2)	0.7
Reclassification for currency translation losses included in net income
Pre-Tax Amount	0.0	10.4	0.0
Tax (Expense) Benefit	0.0	0.0	0.0
After-Tax Amount	0.0	10.4	0.0
Unrealized pension and postretirement benefit obligations
Pre-Tax Amount	63.2	(43.8)	157.3
Tax (Expense) Benefit	(15.9)	10.9	(45.0)
After-Tax Amount	47.3	(32.9)	112.3
Reclassification for pension and postretirement benefit obligations included in net income
Pre-Tax Amount	(5.5)	(1.5)	0.9
Tax (Expense) Benefit	1.4	0.4	(0.2)
After-Tax Amount	(4.1)	(1.1)	0.7
Comprehensive income
Pre-Tax Amount	1,047.7	898.5	1,135.4
Tax (Expense) Benefit	(211.7)	(221.2)	(207.0)
After-Tax Amount	836.0	677.3	928.4
Comprehensive loss attributable to noncontrolling interests
Pre-Tax Amount	(3.9)	(1.7)	0.7
Tax (Expense) Benefit	(0.9)	(0.1)	(1.2)
After-Tax Amount	(4.8)	(1.8)	(0.5)
Comprehensive income attributable to Conagra Brands, Inc.
Pre-Tax Amount	1,051.6	900.2	1,134.7
Tax (Expense) Benefit	(210.8)	(221.1)	(205.8)
After-Tax Amount	$ 840.8	$ 679.1	$ 928.9