Investments - Additional Information (Details) - USD ($) |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Jun. 30, 2025 |
|
| Investments, All Other Investments [Abstract] | |||||
| Gross proceeds from matured or redeemed securities | $ 184,400,000 | $ 403,100,000 | $ 414,900,000 | $ 706,500,000 | |
| Available-for-sale securities, realized gain (loss) | 0 | 300,000 | 0 | 300,000 | |
| Equity securities held at cost | 40,396,000 | 40,396,000 | $ 40,277,000 | ||
| Impairment loss | 0 | 0 | 0 | 3,000,000.0 | |
| Equity securities, upward adjustment | 0 | $ 2,400,000 | 0 | $ 2,400,000 | |
| Equity securities, downward adjustment | $ 0 | $ 0 | |||