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Investments - Summary of Selected Financial information for Hildene (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2025 | Dec. 31, 2024 | May 31, 2025 | Mar. 31, 2025 | Nov. 30, 2024 | Sep. 30, 2024 | May 31, 2024
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total assets |  |  | $ 67,285,344 |  | $ 64,360,309 |  |
Total liabilities |  |  | 56,902,764 |  | 54,134,916 |  |
Total members’ equity |  |  | $ 10,382,174 |  | $ 10,224,987 |  | $ 9,952,186
Hildene Insurance Holdings, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Net increase in members’ equity resulting from operations | $ 27,500 | $ 8,400 |  |  |  |  |
Hildene Insurance Holdings, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total assets |  |  |  | $ 447,900 |  | $ 304,200 |
Total liabilities |  |  |  | 100 |  | 200 |
Total members’ equity |  |  |  | $ 447,800 |  | $ 304,000 |

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