Variable Interest Entities Investments in VIEs That Are Not Consolidated (Details) (USD $)	Jul. 31, 2013	Oct. 31, 2012
Non Consolidated Clo Entities [Abstract]
Total assets held by the non-consolidated entities	$ 1,800,000,000	$ 1,800,000,000
Total collateral management fees receivable held by the Company in non-consolidated entities	2,100,000	2,000,000
Other 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	9,600,000,000	9,000,000,000
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	5,400,000	4,400,000
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