Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 25, 2014	May 26, 2013	May 27, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 315.1	$ 786.1	$ 474.4
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	65.7	32.8	(89.1)
Derivative adjustments, net of tax:
Unrealized derivative adjustments	31.3	32.5	(89.3)
Reclassification for derivative adjustments included in net income	34.4	0.3	0.2
Other comprehensive income (loss):
Unrealized gains (losses) on available-for-sale securities, net of tax	0.1	0.2	(0.1)
Currency translation adjustment:
Unrealized translation gains (losses)	(25.7)	2.1	(62.4)
Reclassification adjustment for gains included in net income	0	0	(6.0)
Pension and post-employment benefit obligations, net of tax:
Unrealized pension and post-employment benefit obligations	15.6	63.8	(64.9)
Unrealized translation gains (losses)	2.1	3.4	(1.8)
Comprehensive income	372.9	888.4	262.1
Comprehensive income attributable to noncontrolling interests	8.0	11.5	2.1
Comprehensive income attributable to ConAgra Foods, Inc.	$ 364.9	$ 876.9	$ 260.0