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Variable Interest Entities Investments in VIEs That Are Not Consolidated (Details) (USD $)
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Apr. 30, 2013
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Oct. 31, 2012
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| Investments in Variable Interest Entities Not Consolidated [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 | 2,000,000 | 2,000,000 |
| 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 | 9,300,000,000 | 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 | 5,100,000 | 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 | $ 400,000 | $ 400,000 |