Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Cash Flows From Operating Activities:
Net income	$ 112,835	$ 92,260
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,502	6,604
Amortization of deferred sales commissions	5,968	5,547
Stock-based compensation	29,520	22,659
Deferred income taxes	18,757	4,268
Net (gains) losses on investments and derivatives	(7,000)	3,646
Equity in net income of affiliates, net of tax	(2,325)	(1,948)
Dividends received from affiliates	2,540	2,895
Amortization of operating lease right-of-use assets	4,422	0
Consolidated CLO entities' operating activities:
Net losses on bank loan, other investments and note obligations	9,342	6,107
Amortization of bank loan investments	(1,757)	(214)
(Increase) decrease in other assets, net of other liabilities	(5,986)	8,258
Decrease in cash due to deconsolidation of CLO entity	(4,606)	0
Changes in operating assets and liabilities:
Management fees and other receivables	242	12,937
Short-term debt securities	17,325	31,999
Investments held by consolidated sponsored funds and separatley managed accounts	(37,561)	(14,606)
Deferred sales commissions	(10,013)	(5,434)
Other assets	22,865	18,602
Accrued compensation	(152,470)	(156,750)
Accounts payable and accrued expenses	6,726	(1,910)
Operating lease liabilities	(3,978)	0
Other liabilities	7,343	(588)
Net cash provided by operating activities	17,691	34,332
Cash Flows From Investing Activities:
Additions to equipment and leasehold improvements	(6,828)	(8,300)
Proceeds from sale of investments	94	4,307
Purchase of investments	(73)	(1,364)
Proceeds from sale of investments in CLO entity note obligations	27,258	0
Consolidated CLO entities' investing activities:
Proceeds from sales of bank loans and other investments	228,167	83,389
Purchase of bank loans and other investments	(243,504)	(361,121)
Net cash provided by (used for) investing activities	5,114	(283,089)
Cash Flows From Financing Activities:
Purchase of additional non-controlling interest	(8,372)	(18,098)
Line of credit issuance costs	0	(930)
Proceeds from issuance of Common Stock	581	0
Principal repayments on notes receivable from stock option exercises	1,215	381
Dividends paid	(45,482)	(43,230)
Net subscriptions received from non-controlling interest holders	40,662	41,772
Consolidated CLO entities' financing activities:
Proceeds from line of credit	0	68,458
Net cash used for financing activities	(55,712)	(74,963)
Effect of currency rate changes on cash and cash equivalents	449	1,134
Net decrease in cash, cash equivalents and restricted cash	(32,458)	(322,586)
Cash, cash equivalents and restricted cash, beginning of period	653,345	866,075
Cash, cash equivalents and restricted cash, end of period	620,887	543,489
Supplemental Cash and Restricted Cash Flow Information:
Cash paid for interest	5,986	6,020
Cash paid for interest by consolidated CLO entities	22,882	0
Cash paid for income taxes, net of refunds	11,663	13,737
Supplemental Schedule of Non-Cash Investing and Financing Transactions:
Increase in equipment and leasehold improvements due to non-cash additions	1,196	4,978
Operating lease right-of-use assets recognized upon adoprtion of new lease guidance	0	270,040
Operating lease liabilities recognized upon adoption of new lease guidance	0	318,824
Exercise of stock options through issuance of notes receivable	122	199
Decrease in non-controlling interests due to net deconsolidations of sponsored investment funds	0	(51,701)
Decrease in bank loans and other investments of consolidated CLO entities due to unsettled sales	(10,870)	(2,288)
Increase in bank loans and other investments of consolidated CLO entities due to unsettled purchases	19,731	84,033
Deconsolidation of CLO Entities:
Decrease in bank loans and other investments	(445,569)	0
Decrease in senior and subordinated loan obligations	(421,601)	0
Non-Voting Common Stock [Member]
Cash Flows From Financing Activities:
Repurchase of Common Stock	(80,291)	(128,169)
Proceeds from issuance of Non-Voting Common Stock	$ 35,975	$ 4,853