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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Nov. 09, 2016 | Feb. 26, 2017 | Feb. 26, 2017 | Feb. 28, 2016 | May 29, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cash payment received from Lamb Weston |  |  | $ 489.0 | $ 0.0 |
Income tax benefit recognized |  | $ 3.5 | 17.5 |  |
Cumulative effect on retained earnings, net of tax |  |  |  |  | $ (3.9)
Increase in cash flows from operating activities |  |  | 846.5 | 738.6 |
Decrease in cash flows from financing activities |  |  | $ 1,107.0 | 2,673.0 |
Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect on retained earnings, net of tax |  |  |  |  | (3.9)
New Accounting Pronouncement, Early Adoption, Effect | ASU 2016-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase in cash flows from operating activities |  |  |  | 43.5 |
Decrease in cash flows from financing activities |  |  |  | $ 43.5 |
New Accounting Pronouncement, Early Adoption, Effect | ASU 2016-09 | Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect on retained earnings, net of tax |  |  |  |  | $ 3.9
Discontinued operations, spinoff | Lamb Weston |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Distribution of the Company's interest in Lamb Weston (as a percent) | 100.00% |  |  |  |
Cash payment received from Lamb Weston | $ 823.5 |  |  |  |

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