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STOCKHOLDERS' EQUITY (Schedule of Dividends) (Details) - $ / shares |  |  |  |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2019 | Jan. 30, 2019 | Aug. 31, 2018 | Feb. 28, 2018 | Jan. 24, 2018 | May 31, 2019 | May 31, 2018
Dividends Payable [Line Items] |  |  |  |  |  |  |
Amount |  |  |  |  |  | $ 0.70 | $ 0.70
2019 Dividend Declared [Member] |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Declared |  |  |  |  |  | Jan. 30, 2019 |
Amount |  | $ 0.70 |  |  |  |  |
2018 Dividend Declared [Member] |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Declared |  |  |  |  |  | Jan. 24, 2018 |
Amount |  |  |  |  | $ 0.70 |  |
2019 First Dividend Paid [Member] |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Record Date |  |  |  |  |  | Feb. 15, 2019 |
Date Paid |  |  |  |  |  | Feb. 28, 2019 |
Payment Amount | $ 0.35 |  |  |  |  |  |
2019 Second Dividend Paid [Member] |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Record Date |  |  |  |  |  | Aug. 15, 2019 |
Date Payable |  |  |  |  |  | Aug. 30, 2019 |
Payment Amount |  |  |  |  |  | $ 0.35 |
2018 First Dividend Paid [Member] |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Record Date |  |  |  |  |  | Feb. 14, 2018 |
Date Paid |  |  |  |  |  | Feb. 28, 2018 |
Payment Amount |  |  |  | $ 0.35 |  |  |
2018 Second Dividend Paid [Member] |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Record Date |  |  |  |  |  | Aug. 15, 2018 |
Date Paid |  |  |  |  |  | Aug. 31, 2018 |
Payment Amount |  |  | $ 0.35 |  |  |  |

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