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Investments - Summary of Selected Financial information for Hildene (Details) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2025
May 31, 2025
Feb. 28, 2025
Jun. 30, 2025
Nov. 30, 2024
Sep. 30, 2024
Aug. 31, 2024
Schedule of Equity Method Investments [Line Items]              
Total assets $ 69,319,709       $ 64,360,309    
Total liabilities 58,818,393       54,134,916    
Total members’ equity 10,500,910       $ 10,224,987   $ 10,115,361
Hildene Insurance Holdings, LLC              
Schedule of Equity Method Investments [Line Items]              
Net increase in members’ equity resulting from operations $ 44,900 $ 27,500 $ 8,400        
Hildene Insurance Holdings, LLC              
Schedule of Equity Method Investments [Line Items]              
Total assets       $ 466,300   $ 304,200  
Total liabilities       700   200  
Total members’ equity       $ 465,600   $ 304,000