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GOODWILL AND OTHER IDENTIFIABLE INTANGIBLE ASSETS - Narrative (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2021 USD ($) | Aug. 30, 2020 USD ($) segment | Feb. 23, 2020 USD ($) | Aug. 25, 2019 USD ($) | Feb. 28, 2021 USD ($) | Feb. 23, 2020 USD ($)
Goodwill [Line Items] |  |  |  |  |  |
Fair value measurements discounted cash flow period |  | 5 years |  |  |  |
Remaining weighted average life of amortizing intangible assets |  |  |  |  | 20 years |
Amortization expense | $ 14,900,000 |  | $ 14,900,000 |  | $ 44,800,000 | $ 44,900,000
Average amortization annual expense in year one | 54,500,000 |  |  |  | 54,500,000 |
Average amortization annual expense in year two | 54,500,000 |  |  |  | 54,500,000 |
Average amortization annual expense in year three | 54,500,000 |  |  |  | 54,500,000 |
Average amortization annual expense in year four | 54,500,000 |  |  |  | 54,500,000 |
Average amortization annual expense in year five | $ 54,500,000 |  |  |  | $ 54,500,000 |
Minimum |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Fair value measurement inputs terminal growth rate |  | 1.00% |  |  |  |
Sides, Components, Enhancers |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Fair value measurement inputs discount rate |  | 6.25% |  |  |  |
Refrigerated & Frozen |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Number of reporting units | segment |  | 2 |  |  |  |
Goodwill impairment loss |  | $ 0 |  |  |  |
Impairment charges for indefinite lived intangibles |  |  |  | $ 15,800,000 |  |
Refrigerated & Frozen | Sides, Components, Enhancers | Maximum |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Percentage of fair value in excess of carrying value |  | 20.00% |  |  |  |
Refrigerated & Frozen and Grocery & Snacks | Selling, general and administrative expenses | Brands and Trademarks |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Impairment charges for indefinite lived intangibles |  |  |  | $ 19,300,000 |  |

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