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INVESTMENTS IN JOINT VENTURES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2020 | May 26, 2019 | May 27, 2018
Schedule of Equity Method Investments [Line Items] |  |  |
Dividends received from equity method investments | $ 51.4 | $ 55.0 | $ 62.5
Equity method investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Purchases from equity method investees | $ 32.5 | 39.4 | $ 34.9
Ardent Mills |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest (as a percent) | 44.00% |  |
Others |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest (as a percent) | 50.00% |  |
Other assets |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying value of equity method investments | $ 798.7 | $ 796.3 |

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