Variable Interest Entities - Variable Interests in Non-Consolidated Variable Interest Entities (Details) - USD ($) $ in Thousands	Nov. 30, 2021	Nov. 30, 2020
Variable Interest Entity [Line Items]
Total assets	$ 54,768,900	$ 47,751,997
Liabilities	47,690,292	41,385,865
Variable interest entity, not primary beneficiary
Variable Interest Entity [Line Items]
Total assets	1,798,800	1,071,000
Liabilities	2,000	200
Maximum Exposure to Loss	3,862,700	1,790,800
VIE Assets	26,367,800	21,935,000
Variable interest entity, not primary beneficiary | CLOs
Variable Interest Entity [Line Items]
Total assets	582,200	60,700
Liabilities	2,000	200
Maximum Exposure to Loss	2,557,100	642,700
VIE Assets	10,277,500	6,849,100
Variable interest entity, not primary beneficiary | Asset-backed vehicles
Variable Interest Entity [Line Items]
Total assets	281,900	251,600
Liabilities	0	0
Maximum Exposure to Loss	359,300	377,200
VIE Assets	3,474,600	2,462,700
Variable interest entity, not primary beneficiary | Related party private equity vehicles
Variable Interest Entity [Line Items]
Total assets	27,100	19,000
Liabilities	0	0
Maximum Exposure to Loss	37,800	30,000
VIE Assets	78,900	53,000
Variable interest entity, not primary beneficiary | Other investment vehicles
Variable Interest Entity [Line Items]
Total assets	907,600	739,700
Liabilities	0	0
Maximum Exposure to Loss	908,500	740,900
VIE Assets	$ 12,536,800	$ 12,570,200