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Note 12 - Share-based Payments (Details Textual) $ / shares in Units, shares in Thousands, $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
May 27, 2022 | Apr. 15, 2019 $ / shares shares | May 29, 2022 USD ($) $ / shares shares | May 30, 2021 USD ($) $ / shares shares | May 31, 2020 USD ($) $ / shares shares | Sep. 19, 2014 shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) | shares |  |  | 0 | 0 | 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  | $ 2,000 | $ 7,000 | $ 3,800 |
Share Price (in dollars per share) | $ / shares |  |  | $ 33.15 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  |  | $ 0 |  |  |
Proceeds from Stock Options Exercised |  |  | 7,800 | 20,500 | 11,000 |
Share-Based Payment Arrangement, Exercise of Option, Tax Benefit |  |  | 500 | 1,700 | 1,400 |
Performance Shares [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  | 1,400 | 34,900 | 31,800 |
Share-Based Payment Arrangement, Expense, Tax Benefit |  |  | $ 700 | 3,600 | 2,900 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares |  |  | 530 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares |  |  | $ 34.13 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested |  |  | $ 27,000 | 33,900 | 8,400 |
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  | $ 10,800 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 1 year 8 months 12 days |  |  |
Performance Shares [Member] | Fiscal 2023 [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  | 3 years |  |  |
Share Based Compensation Arrangement, By Share Based Payment Award, Granted Period (Year) |  |  | 2 years |  |  |
Performance Shares [Member] | Fiscal 2023 [Member] | Minimum [Member] |  |  |  |  |  |
Share Based Compensation Arrangement, By Share Based Payment Award, Vesting Rights Payout, Percentage |  |  | 0 |  |  |
Performance Shares [Member] | Fiscal 2023 [Member] | Maximum [Member] |  |  |  |  |  |
Share Based Compensation Arrangement, By Share Based Payment Award, Vesting Rights Payout, Percentage |  |  | 200 |  |  |
Performance Shares [Member] | Fiscal 2022 [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  | 3 years |  |  |
Performance Shares [Member] | Fiscal 2024 [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  | 3 years |  |  |
Performance Based Restricted Stock Units [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  | $ 1,700 | 2,400 | 2,700 |
Share-Based Payment Arrangement, Expense, Tax Benefit |  |  | $ (400) | 200 | 200 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares |  | 200 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares |  | $ 41.82 |  |  |  |
Share Based Compensation Arrangement, By Share Based Payment Award, Vesting Rights Payout, Percentage | 0 |  |  |  |  |
Share based Compensation Arrangement by Share based Payment Award, Equity Instruments Other than Options, Eligibility Adjustment |  | 25 |  |  |  |
Share based Compensation Arrangement by Share based Payment Award, Vesting Rights Ratio in Relation to Value of Grantees Award, Maximum |  | 8.6 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  | 2.35% |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate |  | 24.92% |  |  |  |
Performance Based Restricted Stock Units [Member] | Minimum [Member] |  |  |  |  |  |
Share Based Compensation Arrangement, By Share Based Payment Award, Vesting Rights Payout, Percentage |  | 0 |  |  |  |
Performance Based Restricted Stock Units [Member] | Maximum [Member] |  |  |  |  |  |
Share Based Compensation Arrangement, By Share Based Payment Award, Vesting Rights Payout, Percentage |  | 500 |  |  |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  | 200 |
Share-Based Payment Arrangement, Expense, Tax Benefit |  |  |  |  | 100 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  | 3 years |  |  |
Share-Based Payment Arrangement, Option [Member] | Minimum [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  | 7 years |  |  |
Share-Based Payment Arrangement, Option [Member] | Maximum [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  | 10 years |  |  |
Conagra Foods Stock Plan [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | shares |  |  |  |  |  | 40,300
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares |  |  | 38,500 |  |  |
Share Unit Awards [Member] | Cash Settled Restricted Stock Units [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period (Year) |  |  | 3 years |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested |  |  |  | 4,300 | 24,300 |
Share Unit Awards [Member] | Stock Settled Share Unit Awards [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  | $ 25,800 | 28,100 | 24,500 |
Share-Based Payment Arrangement, Expense, Tax Benefit |  |  | $ 5,300 | $ 6,100 | $ 5,300 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares |  |  | 1,090 | 900 | 1,300 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares |  |  | $ 34.26 | $ 36.72 | $ 28.32 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested |  |  | $ 26,900 | $ 24,600 | $ 14,200 |
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  | $ 26,500 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 1 year 9 months 18 days |  |  |
Share Unit Awards [Member] | Cash Settled Share Unit Awards [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares |  |  | 0 | 0 | 0 |

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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