Variable Interest Entities (Schedule of Nonconsolidated VIEs) (Details) - USD ($) $ in Thousands		Aug. 31, 2020	Nov. 30, 2019
Variable Interest Entity [Line Items]
Assets	[1]	$ 51,773,988	$ 49,460,234
Liabilities	[1]	42,180,264	39,706,945
Maximum Exposure to Loss		1,988,400	1,796,300
VIE Assets		25,071,000	19,526,200
VIE, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets		1,247,200	1,107,900
Liabilities		1,400	600
CLOs
Variable Interest Entity [Line Items]
Maximum Exposure to Loss		470,400	505,300
VIE Assets		6,509,500	7,845,000
CLOs | VIE, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets		66,300	152,600
Liabilities		1,400	600
Consumer loan and other asset-backed vehicles
Variable Interest Entity [Line Items]
Maximum Exposure to Loss		435,000	490,600
VIE Assets		2,300,400	2,354,800
Consumer loan and other asset-backed vehicles | VIE, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets		308,400	358,300
Liabilities		0	0
Related party private equity vehicles
Variable Interest Entity [Line Items]
Maximum Exposure to Loss		29,600	34,300
VIE Assets		50,700	71,400
Related party private equity vehicles | VIE, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets		18,600	23,000
Liabilities		0	0
Other investment vehicles
Variable Interest Entity [Line Items]
Maximum Exposure to Loss		1,053,400	766,100
VIE Assets		16,210,400	9,255,000
Other investment vehicles | VIE, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets		853,900	574,000
Liabilities		$ 0	$ 0

[1] Total assets include assets related to variable interest entities of $637.5 million and $645.8 million at August 31, 2020 and November 30, 2019, respectively, and Total liabilities include liabilities related to variable interest entities of $3,377.3 million and $3,071.1 million at August 31, 2020 and November 30, 2019, respectively. See Note 7 for additional information related to variable interest entities.