Preferred Stock - Narrative (Details)		12 Months Ended
	Oct. 02, 2017 day $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 $ / shares shares
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		500,000	500,000
Preferred stock, par value (in US$ per share) | $ / shares		$ 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) | $ / shares	$ 1,000	$ 1,026
Conversion price (in US$ per share) | $ / shares	$ 38.32
Undeclared and unpaid preferred dividends | $		$ 389,261
Preferred stock, issued (in shares)	14,700	14,700
Dividend rate	3.50%
Number of trading days | day	20
Number of consecutive trading days | day	30
Number of shares the holder may convert beginning October 2, 2018	4,200
Number of shares the holder may convert beginning October 2, 2019	6,300
Number of shares the holder may convert beginning October 2, 2020	10,500