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Shareholders' Equity (Details)
$ / shares in Units, $ in Millions
 12 Months Ended 140 Months Ended
Jun. 30, 2022
USD ($)
votes
$ / shares
shares
Jun. 30, 2021
$ / shares
shares
Jun. 30, 2022
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 0 6,784,648
Treasury stock acquired less handling fees | $     $ 67.3
Treasury stock acquired, average price per share (in dollars per share)     $ 9.92
Treasury stock retired (in shares) | shares     0
Treasury Stock Reissued      
Treasury Shares      
Treasury stock acquired, average price per share (in dollars per share)     $ 10.06
Treasury stock reissued (in shares) | shares     167,395
Treasury stock reissued average price per share     $ 5.00