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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 26, 2019 | May 27, 2018 | May 28, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense (income) | $ 8.2 | $ 11.8 | $ 13.3
Tax benefit | 2.1 | 3.9 | 5.1
Total intrinsic value of share units vested | 15.7 | $ 11.2 | $ 2.8
Unrecognized compensation expense, net of estimated forfeitures, related to share unit awards | $ 13.2 |  |
Weighted average period for recognition | 1 year 8 months 6 days |  |
Performance period ending in 2019 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Diluted EPS CAGR measurement period | 2 years |  |
Performance period ending in 2019 | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award payout (as a percent) | 0.00% |  |
Performance period ending in 2019 | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award payout (as a percent) | 200.00% |  |
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 2020 and 2021 | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award payout (as a percent) | 0.00% |  |
Performance period ending in 2020 and 2021 | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award payout (as a percent) | 200.00% |  |
One-third | Performance period ending in 2019 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award payout (as a percent) | 33.33% |  |
Other two-thirds | Performance period ending in 2019 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award payout (as a percent) | 66.66% |  |

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