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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounting Changes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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May 27, 2018 | May 28, 2017 | May 29, 2016
ASU 2017-07 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Estimated reclassification impact of benefit (expense) upon adoption of ASU | $ 80.4 | $ 55.2 | $ 303.8
Retained earnings | ASU 2018-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Stranded tax effects from change in tax rate | $ 17.4 |  |

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