Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2018	Jun. 30, 2018
Class A Common Stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,500,000,000	1,500,000,000
Common stock, shares issued, net of treasury stock	385,202,454	383,385,353
Common stock outstanding, net of treasury stock	385,202,454	383,385,353
Common stock, treasury shares	27,368,413	27,368,413
Class B Common Stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued, net of treasury stock	199,630,240	199,630,240
Common stock outstanding, net of treasury stock	199,630,240	199,630,240
Common stock, treasury shares	78,430,424	78,430,424