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Investments - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Jun. 30, 2022
Investments, All Other Investments [Abstract]          
Gross proceeds from matured or redeemed securities $ 709,500 $ 949,300 $ 2,863,900 $ 1,584,800  
Equity securities, at cost $ 43,172   $ 43,172   $ 43,172