Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Cash Flows From Operating Activities:
Net income	$ 127,640	$ 113,050
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,597	12,274
Amortization of deferred sales commissions	11,372	19,971
Stock-based compensation	29,320	27,529
Deferred income taxes	(5,176)	77,562
Net gains on investments and derivatives	(7,680)	(8,613)
Equity in net income of affiliates	(2,383)	(3,962)
Dividends received from affiliates	10,534	1,139
Consolidated CLO entity operating activities:
Net (gains) losses on bank loans, other investments and note obligations	(7,963)	21,725
Amortization of investments	(532)	(713)
Net increase (decrease) in other assets and liabilities, including cash	7,012	(151)
Changes in operating assets and liabilities:
Investment advisory fees and other receivables	1,665	(1,558)
Investments in trading securities	(58,759)	(127,429)
Deferred sales commissions	(5,494)	(9,988)
Other assets	(31,142)	(22,518)
Accrued compensation	(61,329)	(44,940)
Accounts payable and accrued expenses	1,949	(2,369)
Other liabilities	26,727	1,480
Net cash provided by operating activities	48,358	52,489
Cash Flows From Investing Activities:
Additions to equipment and leasehold improvements	(2,479)	(5,880)
Net cash paid in acquisition	(12,335)	(11,595)
Cash paid for intangible assets	(200)	(1,650)
Proceeds from sales of investments	47,407	84,422
Purchase of investments	(6,274)	(678)
Consolidated CLO entity investing activities:
Proceeds from sales and maturities of bank loans and other investments	89,308	167,869
Purchase of bank loans and other investments	(96,525)	(171,610)
Net cash provided by investing activities	18,902	60,878
Cash Flows From Financing Activities:
Proceeds from issuance of Voting Common Stock	56
Proceeds from issuance of Non-Voting Common Stock	11,687	27,030
Repurchase of Non-Voting Common Stock	(51,669)	(65,819)
Principal repayments on notes receivable from stock option exercises	481	780
Excess tax benefit of stock option exercises	1,162	3,331
Dividends paid	(43,982)	(42,773)
Net subscriptions received from (redemptions/distributions paid to) non-controlling interest holders	18,666	93,717
Net cash (used for) provided by financing activities	(63,599)	16,266
Effect of currency rate changes on cash and cash equivalents	94	104
Net increase in cash and cash equivalents	3,755	129,737
Cash and cash equivalents, beginning of period	510,913	307,886
Cash and cash equivalents, end of period	514,668	437,623
Supplemental Cash Flow Information:
Cash paid for interest	16,320	16,320
Cash paid for interest by consolidated CLO entity	8,715	4,273
Cash paid for income taxes, net of refunds	86,090	78,962
Supplemental Disclosure of Non-Cash Information:
Increase in equipment and leasehold improvements due to non-cash additions	180	3,628
Exercise of stock options through issuance of notes receivable	211	490
Consolidation of CLO Entity:
Increase in other assets, net of other liabilities		10,418
Increase in investments		466,440
Increase in borrowings		446,192
Deconsolidations of Sponsored Investment Funds:
Decrease in investments	(6,639)	(74,486)
Decrease in non-controlling interests	$ (6,276)	$ (74,708)