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ACQUISITIONS - Unaudited Pro Forma Information (Details) - Pinnacle Foods Inc. (Pinnacle) - USD ($) $ in Millions | 12 Months Ended
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May 26, 2019 | May 27, 2018
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Pro forma net sales | $ 10,788.1 | $ 11,034.2
Pro forma net income from continuing operations attributable to Conagra Brands, Inc. | $ 803.8 | $ 1,089.7

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