Stockholders' Equity (Narrative) (Details) - $ / shares	2 Months Ended	12 Months Ended
	Sep. 12, 2016	Jun. 30, 2016	Jun. 30, 2015
Dividends Payable [Line Items]
Cash dividends on common stock (in dollars per share)		$ 1.00	$ 1.00
Anti-dilutive options excluded from calculation of EPS		113,250	25,250
Subsequent event [Member]
Dividends Payable [Line Items]
Dividend payable, amount per share	$ 0.25
Dividend payable, date to be paid	2016-09
Dividend payable, date of record	Sep. 22, 2016