Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 25, 2018	Feb. 26, 2017	Feb. 25, 2018	Feb. 26, 2017
Net income
Pre-Tax Amount	$ 257.8	$ 245.5	$ 865.2	$ 896.7
Tax (Expense) Benefit	105.9	(65.3)	(123.7)	(400.6)
Net income	363.7	180.2	741.5	496.1
Unrealized derivative adjustments
Pre-Tax Amount	1.2	4.1	2.2	(1.7)
Tax (Expense) Benefit	(0.3)	(1.6)	(0.7)	0.6
After-Tax Amount	0.9	2.5	1.5	(1.1)
Reclassification for derivative adjustments included in net income
Pre-Tax Amount	0.0	(0.2)	0.1	(0.2)
Tax (Expense) Benefit	0.0	0.1	0.0	0.1
After-Tax Amount	0.0	(0.1)	0.1	(0.1)
Unrealized gains on available-for-sale securities
Pre-Tax Amount	0.7	0.2	1.4	0.6
Tax (Expense) Benefit	(0.1)	(0.1)	(0.4)	(0.2)
After-Tax Amount	0.6	0.1	1.0	0.4
Unrealized currency translation gains (losses)
Pre-Tax Amount	5.1	15.7	25.0	(10.3)
Tax (Expense) Benefit	(0.1)	0.0	(0.1)	0.2
After-Tax Amount	5.0	15.7	24.9	(10.1)
Unrealized pension and post-employment benefit obligations
Pre-Tax Amount	0.0	62.2	43.5	126.9
Tax (Expense) Benefit	0.0	(23.8)	(16.6)	(49.3)
After-Tax Amount	0.0	38.4	26.9	77.6
Reclassification for pension and post-employment benefit obligations included in net income
Pre-Tax Amount	(0.1)	13.0	(0.4)	11.2
Tax (Expense) Benefit	0.0	(5.0)	0.1	(4.3)
After-Tax Amount	(0.1)	8.0	(0.3)	6.9
Comprehensive income
Pre-Tax Amount	264.7	340.5	937.0	1,023.2
Tax (Expense) Benefit	105.4	(95.7)	(141.4)	(453.5)
After-Tax Amount	370.1	244.8	795.6	569.7
Comprehensive income attributable to noncontrolling interests
Pre-Tax Amount	0.5	3.0	2.9	9.0
Tax (Expense) Benefit	(0.3)	(0.3)	(0.9)	(0.5)
After-Tax Amount	0.2	2.7	2.0	8.5
Comprehensive income attributable to Conagra Brands, Inc.
Pre-Tax Amount	264.2	337.5	934.1	1,014.2
Tax (Expense) Benefit	105.7	(95.4)	(140.5)	(453.0)
After-Tax Amount	$ 369.9	$ 242.1	$ 793.6	$ 561.2