Investments - Summary of Selected Financial Information for JCP Fund V (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2022	Sep. 30, 2024	Sep. 30, 2023
Schedule of Equity Method Investments [Line Items]
Total assets	$ 64,360,309	$ 57,905,161
Total liabilities	54,134,916	48,102,620
Total partners’ capital	10,224,987	9,802,135	$ 10,295,479
Net increase (decrease) in net assets resulting from operations		61,400	(4,500)
JCP Fund V
Schedule of Equity Method Investments [Line Items]
Total assets				$ 8,200	$ 6,400
Total liabilities				100	100
Total partners’ capital				$ 8,100	$ 6,300
JCP Fund V
Schedule of Equity Method Investments [Line Items]
Net gains (losses) from our investments in JCP Fund V	$ 700	$ (9,000)	$ 100
Percent of financial information presented	100.00%
Ownership percentage	35.10%
Net increase (decrease) in net assets resulting from operations	$ 1,800
Hildene Insurance Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Percent of financial information presented	100.00%
Ownership percentage	9.26%
Net increase (decrease) in net assets resulting from operations	$ 34,100