Variable Interest Entities - Variable Interests in Non-Consolidated Variable Interest Entities (Details) - USD ($) $ in Thousands	May 31, 2021	Nov. 30, 2020
Variable Interest Entity [Line Items]
Assets	$ 52,171,073	$ 47,751,997
Liabilities	45,483,725	41,385,865
Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Assets	1,230,900	1,071,000
Liabilities	2,400	200
Maximum Exposure to Loss	2,343,000	1,790,800
VIE Assets	20,827,000	21,935,000
CLOs | Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Assets	145,300	60,700
Liabilities	2,400	200
Maximum Exposure to Loss	1,089,700	642,700
VIE Assets	6,684,900	6,849,100
Asset-backed vehicles | Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Assets	265,600	251,600
Liabilities	0	0
Maximum Exposure to Loss	421,200	377,200
VIE Assets	2,584,600	2,462,700
Related party private equity vehicles | Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Assets	23,700	19,000
Liabilities	0	0
Maximum Exposure to Loss	34,600	30,000
VIE Assets	67,200	53,000
Other investment vehicles | Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Assets	796,300	739,700
Liabilities	0	0
Maximum Exposure to Loss	797,500	740,900
VIE Assets	$ 11,490,300	$ 12,570,200