Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Jun. 30, 2017
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	383,087,863	382,294,262
Common stock outstanding, net of treasury stock	383,087,863	382,294,262
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