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EARNINGS PER SHARE - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 26, 2018 | Nov. 25, 2018 | May 31, 2020 | May 26, 2019 | May 27, 2018
Stock options |  |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |  |
Stock options outstanding excluded from EPS calculation (in shares) |  |  | 1.9 | 2.0 | 1.3
Underwritten Public Offering |  |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |  |
Issuance of common stock (in shares) |  | 16.3 |  |  |
Common stock, par value (in dollars per share) |  | $ 5.00 |  |  |
Issuance of Conagra Brands, Inc. common shares, net |  | $ 555.7 |  |  |
Pinnacle Foods Inc. (Pinnacle) |  |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |  |
Company shares issued out of treasury (shares) | 77.5 | 77.5 |  |  |
Issuance of Conagra Brands, Inc. common shares, net | $ 555.7 |  |  |  |

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