CAPITAL STOCK - Shares authorized, issued, and outstanding (Parenthetical) (Details) - $ / shares	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 1	$ 1
Reserved for conversion of preferred stock (in shares)	1,030,166
Prior Cumulative Preferred Stock
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)	$ 5	5
Stated percentage of preferred stock	6.00%
Convertible Cumulative Preferred
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)	$ 20	$ 20
Stated percentage of preferred stock	5.00%