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COMMON STOCK - Common Stock Outstanding (Details) - shares
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Common Class A      
Increase (Decrease) in Stockholders' Equity      
Balance at the beginning of the period (in shares) 225,290,200 221,564,500 224,093,800
Acquisition of treasury stock (in shares) (2,580,500) (4,665,000) (10,986,700)
Conversion of Class B to Class A (in shares) 6,993,400 4,302,400 3,513,900
Stock-based compensation (in shares) 3,814,300 4,088,300 4,943,500
Balance at the end of the period (in shares) 233,517,400 225,290,200 221,564,500
Common Class B      
Increase (Decrease) in Stockholders' Equity      
Balance at the beginning of the period (in shares) 135,235,429 139,537,800 143,051,700
Acquisition of treasury stock (in shares) 0 0 0
Conversion of Class B to Class A (in shares) (6,993,400) (4,302,400) (3,513,900)
Stock-based compensation (in shares) 0 0 0
Balance at the end of the period (in shares) 128,242,029 135,235,429 139,537,800