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RESTRUCTURING ACTIVITIES - Narrative (Details) - USD ($) | 12 Months Ended
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May 27, 2018 | May 28, 2017 | May 29, 2016
Private Brands |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Cash charges excluded from cumulative pre-tax expenses | $ 84,500,000 |  |
Non-cash charges excluded from cumulative pre-tax expenses | 45,700,000 |  |
Charges excluded from cumulative pre-tax expenses | 130,200,000 |  |
Spinoff | Lamb Weston |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Cash charges excluded from cumulative pre-tax expenses | 2,100,000 |  |
SCAE Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Approved expenses (up to) | 900,900,000.0 |  |
Charges incurred or expected to be incurred | 471,600,000 |  |
Cash charges | 322,100,000 |  |
Non-cash charges | 149,500,000 |  |
Restructuring and related cost, incurred cost | 38,000,000 | $ 63,600,000 | $ 281,800,000
Charges that have resulted or will result in cash outflows | 30,600,000 |  |
Non-cash charges anticipated to be recognized | 7,400,000 |  |
Cash charges excluded from cumulative pre-tax expenses | 316,100,000 |  |
Non-cash charges excluded from cumulative pre-tax expenses | $ 144,200,000 |  |

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