Variable Interest Entities Investments in VIEs That Are Not Consolidated (Details) (USD $)	6 Months Ended	12 Months Ended
	Apr. 30, 2014	Oct. 31, 2013
Non Consolidated Clo Entities [Abstract]
Company's subordinated interest in a non-consolidated warehouse stage CLO entity	16.70%	16.70%
Total assets held by the non-consolidated entities	$ 1,900,000,000	$ 1,900,000,000
Total collateral management fees receivable held by the Company in non-consolidated entities	2,000,000	2,100,000
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	10,200,000,000	9,800,000,000
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	6,100,000	5,600,000
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	$ 500,000