Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2018	Jun. 30, 2018
Class of Stock [Line Items]
Common stock, par value (in usd per share)	$ 1	$ 1
Series A Preferred Stock
Class of Stock [Line Items]
Redeemable, convertible Series A preferred stock, par value (in dollars per share)	1	1
Redeemable, convertible Series A preferred stock, liquidation preference (in dollars per share)	1,000	1,000
Class B Common Stock
Class of Stock [Line Items]
Common stock, par value (in usd per share)	$ 1	$ 1