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SHARE-BASED PAYMENTS (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
May. 31, 2015 | May. 25, 2014 | May. 26, 2013 | Sep. 19, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued under the plan | 30,200,000 |  |  |
Stock option granted | 4,400,000 | 3,600,000 | 3,900,000 |
Closing market price of our common stock | $ 38.61 |  |  |
Cash received from option exercises | $ 150.2 | $ 104.6 | $ 259.8 |
Actual tax benefit realized for the tax deductions from option exercises | 26.7 | 17.4 | 28.7 |
Subsidiaries |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | $ 1.4 | $ 2.7 | $ 0.8 |
ConAgra Foods Stock Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued under the plan |  |  |  | 30,000,000.0
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options vesting period | 3 years |  |  |
Weighted average grant date fair value, options | $ 3.36 | $ 4.71 | $ 2.93 |
Total intrinsic value of share units vested | $ 69.5 | $ 46.9 | $ 77.2 |
Compensation expense | 12.4 | 15.3 | 13.5 |
Tax benefit related to Compensation expense | 4.8 | 5.7 | 5.0 |
Unrecognized compensation expense | $ 11.9 |  |  |
Weighted average period | 1 year 4 months 12 days |  |  |
Stock-settled |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | $ 21.0 | 26.1 | 26.7 |
Tax benefit related to Compensation expense | $ 8.1 | $ 9.8 | $ 9.9 |
Shares units granted | 930,000 | 900,000 | 1,000,000 |
Weighted average grant date fair value | $ 31.71 | $ 36.22 | $ 25.59 |
Total intrinsic value of share units vested, other than options | $ 46.6 | $ 46.4 | $ 24.3 |
Cash-settled |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | 29.2 | 12.4 | 8.0 |
Tax benefit related to Compensation expense | $ 11.2 | $ 4.6 | $ 3.0 |
Shares units granted | 890,000 | 800,000 | 900,000 |
Weighted average grant date fair value | $ 30.89 | $ 36.89 | $ 24.74 |
Total intrinsic value of share units vested, other than options | $ 1.6 |  |  |
Share Unit Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options vesting period | 3 years |  |  |
Unrecognized compensation expense | $ 23.2 | $ 28.2 |  |
Weighted average period | 1 year 9 months 24 days | 1 year 8 months 12 days |  |
Performance period ending 2014 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of the targeted number of performance shares, minimum range and will be paid in shares of common stock | 0.00% |  |  |
Percentage of the targeted number of performance shares, maximum range and will be paid in shares of common stock | 220.00% |  |  |
Percentage of target incentive required payout | 25.00% |  |  |
Performance based share plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | $ 5.7 | $ 6.5 | $ 19.9 |
Tax benefit related to Compensation expense | 2.2 | 2.4 | 7.4 |
Unrecognized compensation expense | $ 2.9 |  |  |
Weighted average period | 1 year 9 months 6 days |  |  |
Total intrinsic value of share units vested, other than options | $ 13.9 | 10.4 |  |
Restricted cash plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cash flows decrease and net financing cash flow increase | $ 24.0 | $ 18.9 | $ 21.3 |
Minimum | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options expiration period | 7 years |  |  |
Maximum | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options expiration period | 10 years |  |  |

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