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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2021 | Aug. 30, 2020 | Feb. 23, 2020 | Nov. 24, 2019 | Aug. 25, 2019 | Nov. 24, 2019 | Feb. 28, 2021 | Feb. 23, 2020 | May 31, 2020
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Increase in long-lived assets | $ 27.4 |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  | $ 4.2 | $ 113.5 |
Carrying amount of long-term debt (including current installments) | 8,500.0 |  |  |  |  |  | 8,500.0 |  | $ 9,750.0
Estimated fair value of debt | $ 9,990.0 |  |  |  |  |  | $ 9,990.0 |  | $ 11,350.0
Grocery & Snacks |  |  |  |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Asset impairment charges |  | $ 3.0 |  |  |  | $ 54.4 |  |  |
Indefinite-lived brand impairment charges |  |  |  |  | $ 3.5 |  |  |  |
Refrigerated & Frozen |  |  |  |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  | $ 3.8 | $ 27.6 |  |  |  |  |
Indefinite-lived brand impairment charges |  |  |  |  | $ 15.8 |  |  |  |
Corporate segment |  |  |  |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  | $ 2.9 |  |  |
Minimum |  |  |  |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Long-lived assets additional depreciation in future periods | 15 years |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Long-lived assets additional depreciation in future periods | 25 years |  |  |  |  |  |  |  |

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