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SHARE-BASED PAYMENTS - Performance Share Awards (Narrative) (Details) - Performance Shares - USD ($) $ in Millions | 12 Months Ended
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May 31, 2020 | May 26, 2019 | May 27, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense (income) | $ 31.8 | $ 8.2 | $ 11.8
Tax benefit | 2.9 | 2.1 | 3.9
Total intrinsic value of share units vested | 8.4 | $ 15.7 | $ 11.2
Unrecognized compensation expense, net of estimated forfeitures, related to share unit awards | $ 17.9 |  |
Weighted average period for recognition | 1 year 9 months 18 days |  |
Performance period ending in 2020 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Performance period ending in 2021 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Performance period ending in 2022 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Performance period ending in 2020, 2021 and 2022 | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award payout (as a percent) | 0.00% |  |
Performance period ending in 2020, 2021 and 2022 | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award payout (as a percent) | 200.00% |  |

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