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COMMERCIAL PAPER AND INVESTMENT SECURITIES (Schedule of Amortized Cost and Fair Values of Investments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jun. 30, 2019
AVAILABLE FOR SALE    
Amortized Cost $ 164,774 $ 132,673
Gross Unrealized Gains 390
Gross Unrealized Losses (6,443) (283)
Fair Value 158,331 132,780
HELD TO MATURITY    
Amortized Cost 3,495 3,995
Gross Unrealized Gains 130 85
Gross Unrealized Losses
Fair Value 3,625 4,080
Corporate Debt Securities [Member]    
AVAILABLE FOR SALE    
Amortized Cost 115,287 104,760
Gross Unrealized Gains 355
Gross Unrealized Losses (5,144) (207)
Fair Value 110,143 104,908
Foreign Debt Securities [Member]    
AVAILABLE FOR SALE    
Amortized Cost 32,585 26,583
Gross Unrealized Gains [1] 35
Gross Unrealized Losses [1] (1,299) (75)
Fair Value 31,286 26,543
Commercial Paper [Member]    
AVAILABLE FOR SALE    
Amortized Cost 16,902
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value 16,902
Obligations of States and Political Subdivisions [Member]    
AVAILABLE FOR SALE    
Amortized Cost   1,330
Gross Unrealized Gains  
Gross Unrealized Losses   (1)
Fair Value   1,329
HELD TO MATURITY    
Amortized Cost 3,495 3,995
Gross Unrealized Gains 130 85
Gross Unrealized Losses
Fair Value $ 3,625 $ 4,080
[1] U.S. dollar denominated investment-grade corporate bonds of large foreign corporate issuers.