Preferred Stock - Narrative (Details) - USD ($)		12 Months Ended
	Oct. 02, 2017	Jun. 30, 2020	Jun. 30, 2019
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		500,000	500,000
Preferred stock, par value (in US$ per share)		$ 1	$ 1
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		21,000
Preferred stock, par value (in US$ per share)	$ 1,000	$ 1,101
Conversion price (in US$ per share)	$ 38.32
Undeclared and unpaid preferred dividends		$ 1,478,429
Preferred stock, issued (in shares)	14,700	14,700
Dividend rate	3.50%