Stockholders' Equity (Narrative) (Details) - $ / shares |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Sep. 30, 2020 |
Jun. 30, 2020 |
Jun. 30, 2019 |
|
| Dividends Payable [Line Items] | |||
| Cash dividends on common stock (in dollars per share) | $ 1.00 | $ 2.00 | |
| Anti-dilutive options excluded from calculation of EPS | 276,712 | 196,039 | |
| Subsequent Event [Member] | |||
| Dividends Payable [Line Items] | |||
| Dividend payable, amount per share | $ 0.25 | ||
| Dividend payable, date to be paid | Oct. 14, 2020 | ||
| Dividend payable, date of record | Oct. 05, 2020 | ||
| Special Dividend [Member] | |||
| Dividends Payable [Line Items] | |||
| Cash dividends on common stock (in dollars per share) | $ 1.00 | ||