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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