Variable Interest Entities - Variable Interests in Non-Consolidated Variable Interest Entities (Details) - USD ($) $ in Thousands	Feb. 28, 2021	Nov. 30, 2020
Variable Interest Entity [Line Items]
Assets	$ 51,386,411	$ 47,751,997
Liabilities	44,830,780	41,385,865
Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Assets	1,200,500	1,071,000
Liabilities	5,400	200
Maximum Exposure to Loss	2,489,000	1,790,800
VIE Assets	23,300,400	21,935,000
CLOs | Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Assets	163,400	60,700
Liabilities	5,400	200
Maximum Exposure to Loss	1,343,500	642,700
VIE Assets	9,595,000	6,849,100
Consumer loan and other asset-backed vehicles | Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Assets	266,900	251,600
Liabilities	0	0
Maximum Exposure to Loss	363,300	377,200
VIE Assets	2,580,500	2,462,700
Related party private equity vehicles | Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Assets	18,700	19,000
Liabilities	0	0
Maximum Exposure to Loss	29,500	30,000
VIE Assets	52,300	53,000
Other investment vehicles | Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Assets	751,500	739,700
Liabilities	0	0
Maximum Exposure to Loss	752,700	740,900
VIE Assets	$ 11,072,600	$ 12,570,200