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STOCK PROGRAMS - Performance Share Units (Details) - $ / shares
1 Months Ended 12 Months Ended
Sep. 30, 2017
Jan. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Common Class A          
Share-based Compensation Arrangement by Share-based Payment Award          
Common Stock issued (in shares)     5,087,400 5,038,500 3,411,900
Performance Share Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Vesting period     3 years    
Granted (in shares)     216,600    
Grant date fair value (in dollars per share)     $ 107.95    
Other Equity Compensation Plans          
Nonvested at the beginning of the period (in shares)     1,022,200    
Granted (in shares)     216,600    
Vested (in shares)     (275,100) (300,000)  
Nonvested at the end of the period (in shares)     963,700 1,022,200  
Weighted-Average Grant Date Fair Value          
Nonvested at the beginning of the period (in dollars per share)     $ 82.00    
Grant date fair value (in dollars per share)     107.95    
Vested (in dollars per share)     77.35    
Nonvested at the end of the period (in dollars per share)     $ 89.16 $ 82.00  
Performance Share Units | Common Class A          
Share-based Compensation Arrangement by Share-based Payment Award          
Payout for performance share units in Class A Common Stock (in shares)     400,000    
Common Stock issued (in shares) 200,000        
PSU settled June 30, 2020 | Performance Share Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Granted (in shares)   300,000 200,000    
Grant date fair value (in dollars per share)   $ 80.79 $ 107.95    
Other Equity Compensation Plans          
Granted (in shares)   300,000 200,000    
Weighted-Average Grant Date Fair Value          
Grant date fair value (in dollars per share)   $ 80.79 $ 107.95    
PSU settled June 30, 2022 | Performance Share Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Granted (in shares)   200,000      
Grant date fair value (in dollars per share)   $ 80.79      
Other Equity Compensation Plans          
Granted (in shares)   200,000      
Weighted-Average Grant Date Fair Value          
Grant date fair value (in dollars per share)   $ 80.79