Variable Interest Entities Investments in VIEs That Are Not Consolidated (Details) (USD $)	9 Months Ended	12 Months Ended
	Jul. 31, 2012 NrEntities	Oct. 31, 2011 NrEntities
Investments In Variable Interest Entities That Are Not Consolidated Details [Abstract]
The total non-consolidated CLO entities	3	3
Total assets held by the non-consolidated entities	$ 1,700,000,000	$ 1,900,000,000
Total collateral management fees receivable held by the Company in non-consolidated entities	2,000,000	3,000,000
Other Entities Variable Interest Entity In Non Consolidated Entities [Abstract]
Total assets of the privately offered equity funds that the Company holds a variable interest in but is not deemed to be a primary beneficiary	9,200,000,000	9,600,000,000
Total investments of the privately offered equity funds that the Company holds a variable interest in but is not deemed to be a primary beneficiary	4,300,000	3,700,000
Total collateral management fees receivable of the privately offered equity funds that the Company holds a variable interest in but is not deemed to be a primary beneficiary	$ 500,000	$ 400,000