Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 25, 2014	May. 26, 2013
Pre-Tax Amount
Net income (loss)	$ (725.6)	$ 617.9	$ 1,186.3
Derivative adjustments:
Unrealized derivative adjustments	0.0	49.6	51.7
Reclassification for derivative adjustments included in net income	(0.5)	55.0	0.4
Unrealized gains on available-for-sale securities	0.7	0.2	0.3
Unrealized currency translation gains (losses)	(145.2)	(25.7)	2.1
Pension and post-employment benefit obligations:
Unrealized pension and post-employment benefit obligations	(94.9)	23.8	103.8
Reclassification for pension and post-employment benefit obligations included in net income	0.8	3.3	5.4
Comprehensive income (loss)	(964.7)	724.1	1,350.0
Comprehensive income attributable to noncontrolling interests	4.6	8.9	13.1
Comprehensive income (loss) attributable to ConAgra Foods, Inc.	(969.3)	715.2	1,336.9
Tax (Expense) Benefit
Net income (loss)	484.8	(302.8)	(400.2)
Derivative adjustments:
Unrealized derivative adjustments	0.0	(18.3)	(19.2)
Reclassification for derivative adjustments included in net income	0.2	(20.6)	(0.1)
Unrealized gains on available-for-sale securities	(0.3)	(0.1)	(0.1)
Unrealized currency translation gains (losses)	0.0	0.0	0.0
Pension and post-employment benefit obligations:
Unrealized pension and post-employment benefit obligations	36.7	(8.2)	(40.0)
Reclassification for pension and post-employment benefit obligations included in net income	(0.3)	(1.2)	(2.0)
Comprehensive income (loss)	521.1	(351.2)	(461.6)
Comprehensive income attributable to noncontrolling interests	(0.4)	(0.9)	(1.6)
Comprehensive income (loss) attributable to ConAgra Foods, Inc.	521.5	(350.3)	(460.0)
After-Tax Amount
Net income (loss)	(240.8)	315.1	786.1
Derivative adjustments:
Unrealized derivative adjustments	0.0	31.3	32.5
Reclassification for derivative adjustments included in net income	(0.3)	34.4	0.3
Unrealized gains on available-for-sale securities	0.4	0.1	0.2
Unrealized currency translation gains (losses)	(145.2)	(25.7)	2.1
Pension and post-employment benefit obligations:
Unrealized pension and post-employment benefit obligations	(58.2)	15.6	63.8
Reclassification for pension and post-employment benefit obligations included in net income	0.5	2.1	3.4
Comprehensive income (loss)	(443.6)	372.9	888.4
Comprehensive income attributable to noncontrolling interests	4.2	8.0	11.5
Comprehensive income (loss) attributable to ConAgra Foods, Inc.	$ (447.8)	$ 364.9	$ 876.9