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RESTRUCTURING ACTIVITIES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended | 18 Months Ended | 76 Months Ended |
--- | --- | --- | --- | ---
May 31, 2020 | May 26, 2019 | May 27, 2018 | May 31, 2020 | May 31, 2020 | Dec. 31, 2018
Pinnacle Integration Restructuring Plan |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Charges approved for incurrence |  |  |  |  |  | $ 360.0
Cash charges approved for incurrence |  |  |  |  |  | 255.0
Non-cash charges approved for incurrence |  |  |  |  |  | $ 105.0
Charges expected to be incurred | $ 360.2 |  |  | $ 360.2 | $ 360.2 |
Cash charges incurred or expected to be incurred | 277.2 |  |  | 277.2 | 277.2 |
Non-cash charges incurred or expected to be incurred | 83.0 |  |  | 83.0 | 83.0 |
Recognized charges | 73.8 | $ 168.2 |  | 242.0 |  |
Charges that have resulted or will result in cash outflows | 51.2 |  |  |  |  |
Non-cash charges | 22.6 |  |  |  |  |
Charges that have resulted or will result in cash outflows |  |  |  | 212.4 |  |
Non-cash charges |  |  |  | 29.6 |  |
Conagra Restructuring Plan |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Charges approved for incurrence | 131.1 |  |  | 131.1 | 131.1 |
Cash charges approved for incurrence | 38.2 |  |  | 38.2 | 38.2 |
Non-cash charges approved for incurrence | 92.9 |  |  | 92.9 | 92.9 |
Charges expected to be incurred | 129.5 |  |  | 129.5 | 129.5 |
Cash charges incurred or expected to be incurred | 40.1 |  |  | 40.1 | 40.1 |
Non-cash charges incurred or expected to be incurred | 89.4 |  |  | 89.4 | 89.4 |
Recognized charges | 64.4 | 2.2 |  | 66.6 |  |
Charges that have resulted or will result in cash outflows | 11.4 |  |  |  |  |
Non-cash charges | 53.0 |  |  |  |  |
Charges that have resulted or will result in cash outflows |  |  |  | 12.8 |  |
Non-cash charges |  |  |  | $ 53.8 |  |
SCAE Plan |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Recognized charges | $ 1.3 | $ 9.6 | $ 38.0 |  | 471.2 |
Charges that have resulted or will result in cash outflows |  |  |  |  | 322.0 |
Non-cash charges |  |  |  |  | 149.2 |
SCAE Plan | Cost of goods sold |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Recognized charges |  |  |  |  | 103.3 |
SCAE Plan | Selling, general and administrative expenses |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Recognized charges |  |  |  |  | 365.6 |
SCAE Plan | Reclassified to Pension and postretirement non-service income |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Recognized charges |  |  |  |  | $ 2.3 |

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