Preferred Stock - Narrative (Details) - $ / shares	Mar. 31, 2020	Jun. 30, 2019	Oct. 02, 2017
Class of Stock [Line Items]
Preferred Stock, Shares Authorized (in shares)	500,000	500,000
Preferred stock, par value (in US$ per share)	$ 1	$ 1
Convertible Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Authorized (in shares)	21,000
Series A Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Authorized (in shares)	21,000,000
Preferred stock, par value (in US$ per share)	$ 1,091
Preferred stock, issued (in shares)	14,700,000		14,700