Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	May 27, 2018	May 28, 2017	May 29, 2016
Net income (loss)
Pre-Tax Amount	$ 972.3	$ 989.2	$ (1,033.6)
Tax (Expense) Benefit	(160.5)	(341.2)	367.7
Net income (loss)	811.8	648.0	(665.9)
Unrealized derivative adjustments
Pre-Tax Amount	2.9	(1.0)	0.0
Tax (Expense) Benefit	(0.9)	0.4	0.0
After-Tax Amount	2.0	(0.6)	0.0
Reclassification for derivative adjustments included in net income
Pre-Tax Amount	0.1	(0.2)	(2.1)
Tax (Expense) Benefit	0.0	0.1	0.8
After-Tax Amount	0.1	(0.1)	(1.3)
Unrealized gains on available-for-sale securities
Pre-Tax Amount	1.1	0.5	0.1
Tax (Expense) Benefit	(0.3)	(0.2)	0.0
After-Tax Amount	0.8	0.3	0.1
Unrealized currency translation gains (losses)
Pre-Tax Amount	0.8	(13.6)	(58.9)
Tax (Expense) Benefit	(0.1)	0.2	0.0
After-Tax Amount	0.7	(13.4)	(58.9)
Reclassification for currency translation losses included in net income
Pre-Tax Amount	0.0	0.0	73.4
Tax (Expense) Benefit	0.0	0.0	0.0
After-Tax Amount	0.0	0.0	73.4
Unrealized pension and post-employment benefit obligations
Pre-Tax Amount	157.3	209.2	(37.7)
Tax (Expense) Benefit	(45.0)	(80.6)	14.8
After-Tax Amount	112.3	128.6	(22.9)
Reclassification for pension and post-employment benefit obligations included in net income
Pre-Tax Amount	0.9	10.4	(14.5)
Tax (Expense) Benefit	(0.2)	(4.0)	4.9
After-Tax Amount	0.7	6.4	(9.6)
Comprehensive income (loss)
Pre-Tax Amount	1,135.4	1,194.5	(1,073.3)
Tax (Expense) Benefit	(207.0)	(425.3)	388.2
After-Tax Amount	928.4	769.2	(685.1)
Comprehensive income attributable to noncontrolling interests
Pre-Tax Amount	0.7	12.6	7.8
Tax (Expense) Benefit	(1.2)	(0.7)	(0.9)
After-Tax Amount	(0.5)	11.9	6.9
Comprehensive income (loss) attributable to Conagra Brands, Inc.
Pre-Tax Amount	1,134.7	1,181.9	(1,081.1)
Tax (Expense) Benefit	(205.8)	(424.6)	389.1
After-Tax Amount	$ 928.9	$ 757.3	$ (692.0)