Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 24, 2014	Aug. 25, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 484.5	$ 147.2
Derivative adjustments, net of tax:
Unrealized derivative adjustments	0	45.5
Reclassification for derivative adjustments included in net income	(0.3)	0.1
Unrealized gains on available-for-sale securities, net of tax	0.1	0.1
Unrealized currency translation losses	(17.7)	(31.0)
Pension and post-employment benefit obligations, net of tax:
Unrealized pension and post-employment benefit obligations	2.8	(0.7)
Reclassification for pension and post-employment benefit obligations included in net income	(0.1)	0.5
Comprehensive income	469.3	161.7
Less: Comprehensive loss attributable to noncontrolling interests	(0.8)	(9.1)
Comprehensive income attributable to ConAgra Foods, Inc.	$ 470.1	$ 170.8