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DISCONTINUED OPERATIONS AND OTHER DIVESTITURES - Private Brands Operations (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 26, 2017 | Feb. 28, 2016 | May 27, 2018 | May 28, 2017 | May 29, 2016 | Feb. 01, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Pre-tax charge to write-down goodwill and long-lived assets |  |  | $ 14.7 | $ 343.3 | $ 62.6 |
Loss on extinguishment of debt |  |  | 0.0 | 93.3 | 23.9 |
Senior notes |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt | $ 32.7 | $ 23.9 |  |  |  |
Ralcorp |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Aggregate principal amount of senior notes repaid |  | $ 33.9 |  |  | 33.9 |
Loss on extinguishment of debt |  |  |  |  | 5.4 |
Ralcorp | Senior notes | Senior notes due August 15, 2020 |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Aggregate principal amount of senior notes repaid |  |  |  |  | $ 17.2 |
Stated interest rate (percent) |  |  |  |  | 4.95% |
Effective interest rate |  |  |  |  | 2.83% |
Ralcorp | Senior notes | Senior notes due August 15, 2039 |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Aggregate principal amount of senior notes repaid |  |  |  |  | $ 16.7 |
Stated interest rate (percent) |  |  |  |  | 6.625% |
Effective interest rate |  |  |  |  | 4.82% |
Lamb Weston | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Transition services income for performance of services |  |  | 2.2 | 4.2 |  |
Private Brands | Disposed of by sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Cash proceeds from disposition on a debt-free basis |  |  |  |  |  | $ 2,600.0
Transition services income for performance of services |  |  | $ 2.2 | $ 16.9 | $ 8.3 |
Private Brands | Held for sale, discontinued operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Pre-tax charge to write-down goodwill and long-lived assets |  |  |  |  | 1,920.0 |
After-tax charge to write-down goodwill and long-lived assets |  |  |  |  | $ 1,440.0 |

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