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Shareholders' Equity (Details) $ / shares in Units, $ in Millions | 12 Months Ended | 116 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) votes $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) votes $ / shares shares
Common Shares |  |  |  |
Common shares, authorized (in shares) | shares | 100,000,000 | 100,000,000 |  | 100,000,000
Common shares, par value (in dollars per share) | $ 0.002 | $ 0.002 |  | $ 0.002
Number of votes per each common share | votes | 1 |  |  | 1
Common stock, dividends declared per share | $ 0 |  |  |
Treasury Shares |  |  |  |
Share repurchase program, authorized amount | $ | $ 30.0 |  |  | $ 30.0
Share repurchase program, remaining authorized amount | $ | $ 13.4 |  |  | $ 13.4
Treasury stock acquired, shares repurchased (in shares) | shares | 0 | 111,509 | 950,046 | 6,784,648
Treasury stock acquired less handling fees | $ |  | $ 1.5 | $ 15.1 | $ 67.3
Treasury stock acquired, average price per share (in dollars per share) |  | $ 13.43 | $ 15.86 | $ 9.92
Treasury stock retired (in shares) | shares | 0 |  |  |
Treasury Stock Reissued [Member] |  |  |  |
Treasury Shares |  |  |  |
Treasury stock acquired, average price per share (in dollars per share) |  |  |  | $ 10.32
Treasury stock reissued (in shares) | shares |  |  |  | 145,428
Treasury stock reissued average price per share |  |  |  | $ 5.30

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