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STOCKHOLDERS' EQUITY (Schedule of Dividends) (Details) - $ / shares |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2017 | Feb. 28, 2017 | Feb. 01, 2017 | Feb. 29, 2016 | Feb. 03, 2016 | May 31, 2017 | May 31, 2016 | May 31, 2017 | May 31, 2016 | Aug. 31, 2016
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  | $ 0.70 | $ 0.70 |
2017 Dividend Declared [Member] |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Declared |  |  |  |  |  |  |  | Feb. 01, 2017 |  |
Amount |  |  | $ 0.70 |  |  |  |  |  |  |
2016 Dividend Declared [Member] |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Declared |  |  |  |  |  |  |  | Feb. 03, 2016 |  |
Amount |  |  |  |  | $ 0.70 |  |  |  |  |
2017 First Dividend Paid [Member] |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  |  |  |  |  | Feb. 15, 2017 |  |
Date Paid |  |  |  |  |  |  |  | Feb. 28, 2017 |  |
Payment Amount |  | $ 0.35 |  |  |  |  |  |  |  |
2017 Second Dividend Paid [Member] |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  |  |  |  |  | Aug. 15, 2017 |  |
Date Payable |  |  |  |  |  |  |  | Aug. 31, 2017 |  |
2017 Second Dividend Paid [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Payment Amount | $ 0.35 |  |  |  |  |  |  |  |  |
2016 First Dividend Paid [Member] |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  |  |  |  |  | Feb. 15, 2016 |  |
Date Paid |  |  |  |  |  |  |  | Feb. 29, 2016 |  |
Payment Amount |  |  |  | $ 0.35 |  |  |  |  |  |
2016 Second Dividend Paid [Member] |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  |  |  |  |  | Aug. 15, 2016 |  |
Date Paid |  |  |  |  |  |  |  | Aug. 31, 2016 |  |
Payment Amount |  |  |  |  |  |  |  |  |  | $ 0.35

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