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INVESTMENTS IN JOINT VENTURES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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May 27, 2018 | May 28, 2017 | May 29, 2016
Schedule of Equity Method Investments [Line Items] |  |  |
Dividends received from equity method investments | $ 62.5 | $ 68.2 | $ 40.4
Other assets |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying value of equity method investments | 776.2 | 741.3 |
Equity method investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Purchases from equity method investees | $ 34.9 |  | 61.2
Sales to equity method investees |  | 41.8 | 1.6
Others |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest (as a percent) | 50.00% |  |
Ardent Mills |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest (as a percent) | 44.00% |  |
Ardent Mills | Equity method investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Sales to equity method investees |  | $ 0.1 | $ 9.7

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