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Fair Value Measurements (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2023 | Sep. 30, 2022
Fair Value Measurements (Details) [Line Items] |  |  |
Net change in unrealized gain (loss) |  | $ 26.5 | $ (2.5)
Investment transferred in/out, description |  | Reclassifications impacting Level 3 of the fair value hierarchy are reported as transfers in/out of the Level 3 category as of the beginning of the quarter in which the reclassifications occur. During the year ended September 30, 2023, no investments were transferred in or out of Level 3. During the year ended September 30, 2022, $5,248 (in thousands) of investments were transferred out of Level 3 and $1,923 (in thousands) of investments were transferred into Level 3. |
Membership interest percentage | 5.00% |  |
Aggregate fair value | $ 2.4 |  |
Lydell Jewelry Design Studio, LLC [Member] |  |  |
Fair Value Measurements (Details) [Line Items] |  |  |
Membership interest percentage | 3.80% |  |

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