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SHARE-BASED PAYMENTS - Stock Option Plan (Narrative) (Details) - USD ($) | 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] |  |  |
Options granted (in shares) | 0 | 0 | 0
Total intrinsic value of options exercised | $ 3,800,000 | $ 7,900,000 | $ 15,800,000
Closing market price of common stock (in dollars per share) | $ 34.79 |  |
Unrecognized compensation expense, net of estimated forfeitures, related to stock options | $ 0 |  |
Cash received from option exercises | 11,000,000.0 | 12,400,000 | 25,100,000
Actual tax benefit realized for tax deductions from option exercises | $ 1,400,000 | 2,300,000 | 5,300,000
Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Compensation expense (income) | $ 200,000 | 2,200,000 | 4,200,000
Tax benefit | $ 100,000 | 500,000 | 1,400,000
Options | Subsidiary |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense (income) |  | $ 200,000 | $ 400,000
Options | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period of options | 7 years |  |
Options | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period of options | 10 years |  |

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