STOCKHOLDERS EQUITY (Schedule of Dividends) (Details) - $ / shares						9 Months Ended
	Feb. 29, 2016	Feb. 03, 2016	Aug. 31, 2015	Feb. 27, 2015	Feb. 04, 2015	May 31, 2016	May 31, 2015
Dividends Payable [Line Items]
Amount						$ 0.70	$ 0.70
2016 Dividend Declared [Member]
Dividends Payable [Line Items]
Declared						Feb. 03, 2016
Amount		$ 0.70
2015 Dividend Declared [Member]
Dividends Payable [Line Items]
Declared						Feb. 04, 2015
Amount					$ 0.70
2016 First Dividend Paid [Member]
Dividends Payable [Line Items]
Record Date						Feb. 15, 2016
Date Paid						Feb. 29, 2016
Payment Amount Paid (dollars per share)	$ 0.35
2016 Second Dividend Paid [Member]
Dividends Payable [Line Items]
Record Date						Aug. 15, 2016
Date Payable						Aug. 31, 2016
Payment Amount Payable						$ 0.35
2015 First Dividend Paid [Member]
Dividends Payable [Line Items]
Record Date						Feb. 13, 2015
Date Paid						Feb. 27, 2015
Payment Amount Paid (dollars per share)				$ 0.35
2015 Second Dividend Paid [Member]
Dividends Payable [Line Items]
Record Date						Aug. 14, 2015
Date Paid						Aug. 31, 2015
Payment Amount Paid (dollars per share)			$ 0.35