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PRE-TAX INCOME AND INCOME TAXES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2020 | May 26, 2019 | May 27, 2018
Tax Credit Carryforward [Line Items] |  |  |
Income taxes paid, net of refunds | $ 178.0 | $ 133.8 | $ 164.1
Liabilities for gross unrecognized tax benefits | 35.8 | 44.1 |
Related liability for gross interest and penalties | 7.4 | 11.7 |
Tax positions for which deductibility is high but timing is uncertain | 0.7 |  |
Interest and penalties recognized | (4.3) | 1.2 | 1.6
Net amount of unrecognized tax benefits that, if recognized, would favorably impact effective tax rate | 30.3 | 37.3 |
Estimated decrease in gross unrecognized tax benefits | 16.0 |  |
Foreign net operating loss carryforwards | 27.3 |  |
Foreign net operating loss carryforwards (expiring between fiscal 2021 and 2041) | 13.3 |  |
Foreign net operating loss carryforwards with no expiration dates | 14.0 |  |
Federal net operating loss carryforwards | 126.5 |  |
Tax effected state net operating loss carryforwards | 42.1 |  |
Foreign tax credits (expiring between fiscal 2025 and 2030) | 9.7 |  |
State tax credits | 11.9 |  |
Net decrease in valuation allowance | 9.8 | $ 1.5 | $ 273.8
United States | Capital loss carryforwards |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Capital loss carryforwards related to the private brands divestiture | 2,600.0 |  |
State | Capital loss carryforwards |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Capital loss carryforwards related to the private brands divestiture | 165.0 |  |
Discontinued operations |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Estimated decrease in gross unrecognized tax benefits | $ 6.6 |  |
Minimum |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Statutes of limitations, term | 3 years |  |
Maximum |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Statutes of limitations, term | 5 years |  |

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