Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Cash Flows From Operating Activities:
Net income	$ 141,974	$ 132,687
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,328	10,396
Unamortized loss on derivative instrument	(684)	0
Amortization of deferred sales commissions	7,884	8,006
Stock-based compensation	39,214	36,607
Deferred income taxes	8,823	10,551
Net losses (gains) on investments and derivatives	453	(1,374)
Equity in net income of affiliates, net of amortization	(5,650)	(4,996)
Dividends received from affiliates	5,100	5,785
Consolidated CLO entity's operating activities:
Net gains on bank loans, other investments and note obligations	0	(8,594)
Amortization	0	(269)
Net increase in other assets and liabilities, including cash and cash equivalents	0	82,263
Changes in operating assets and liabilities:
Management fees and other receivables	(5,083)	17,698
Investments in trading securities	(162,692)	(24,446)
Deferred sales commissions	(13,280)	(8,621)
Other assets	8,406	13,135
Accrued compensation	(73,589)	(91,086)
Accounts payable and accrued expenses	4,550	(3,738)
Other liabilities	46,947	(157)
Net cash provided by operating activities	12,701	173,847
Cash Flows From Investing Activities:
Additions to equipment and leasehold improvements	(6,066)	(5,293)
Issuance of loan to affiliate	0	(5,000)
Net cash paid in acquisition	(63,605)	(10,130)
Cash paid for intangible assets	0	(25)
Proceeds from sale of investments	5,992	8,808
Purchase of investments	(67)	(113)
Consolidated CLO entity's investing activities:
Proceeds from sales and maturities of bank loans and other investments	0	33,141
Purchase of bank loans and other investments	0	(118,289)
Net cash used for investing activities	(63,746)	(96,901)
Cash Flows From Financing Activities:
Purchase of additional non-controlling interest	(9,451)	(15,580)
Debt issuance costs	(2,761)	0
Proceeds from issuance of debt	298,896	0
Proceeds from issuance of Voting Common Stock	0	232
Proceeds from issuance of Non-Voting Common Stock	45,421	25,854
Repurchase of Voting Common Stock	0	(77)
Repurchase of Non-Voting Common Stock	(78,984)	(144,071)
Principal repayments on notes receivable from stock option exercises	2,660	1,283
Excess tax benefit of stock option exercises	8,182	3,023
Dividends paid	(63,005)	(60,201)
Net subscriptions received from (redemptions/distributions paid to) non-controlling interest holders	88,859	(2,201)
Consolidated CLO entities' financing activities:
Net cash provided by (used for) financing activities	289,817	(191,738)
Effect of currency rate changes on cash and cash equivalents	512	395
Net increase (decrease) in cash and cash equivalents	239,284	(114,397)
Cash and cash equivalents, beginning of period	424,174	465,558
Cash and cash equivalents, end of period	663,458	351,161
Supplemental Cash Flow Information:
Cash paid for interest	14,205	14,206
Cash paid for income taxes, net of refunds	40,367	47,040
Supplemental Disclosure of Non-Cash Information:
Increase in equipment and leasehold improvements due to non-cash additions	110	1,651
Exercise of stock options through issuance of notes receivable	771	531
Non-controlling interest call option exercises recorded in other liabilities	320	0
Net Consolidations (Deconsolidations) of Sponsored Investment Funds:
Increase (decrease) in investments	136,611	(720)
Increase in other assets, net of other liabilities	22,073	0
Increase (decrease) in non-controlling interests	$ 73,843	$ (698)