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Acquisitions, Goodwill and Intangible Assets 1 (Details) (USD $)
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12 Months Ended |
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Oct. 31, 2012
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Oct. 31, 2011
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Oct. 31, 2010
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| Business Acquisition Contingent Consideration [Line Items] |
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| Increase in goodwill due to contingent payment (TABS) |
$ 12,334,000 |
$ 6,516,000 |
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Parametric Portfolio Associates [Member]
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| Business Acquisition Contingent Consideration [Line Items] |
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| Minority interest ownership percentage purchased by parent |
1.70% |
0.50% |
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| Company's increase in profit interest percentage, during the period |
2.90% |
0.90% |
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| Non-controlling interest holders capital ownership percentage, end of period |
3.40% |
5.20% |
5.70% |
| Non-controlling interest holders profits interest, end of period |
9.70% |
11.40% |
11.10% |
| Profits interest granted to non-controlling interest holders |
1.10% |
1.20% |
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| Remaining non-controlling interest holders capital interest percentage that may be sold to the Company |
3.40% |
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| Remaining non-controlling interest holders right to profits, expressed as a percentage |
5.70% |
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| Purchase of non-controlling interests |
17,000,000 |
4,300,000 |
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Parametric Risk Advisors [Member]
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| Business Acquisition Contingent Consideration [Line Items] |
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| Minority interest ownership percentage purchased by parent |
10.00% |
9.00% |
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| Purchase of non-controlling interests |
2,900,000 |
2,300,000 |
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| Company's capital ownership interest at the end of the period |
70.00% |
60.00% |
51.00% |
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Atlanta Capital [Member]
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| Business Acquisition Contingent Consideration [Line Items] |
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| Non-controlling interest holders profits interest, end of period |
18.10% |
16.90% |
15.20% |
| Profits interest granted to non-controlling interest holders |
1.20% |
1.70% |
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| Remaining non-controlling interest holders capital interest percentage that may be sold to the Company |
10.30% |
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Fox Asset Management [Member]
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| Business Acquisition Contingent Consideration [Line Items] |
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| Minority interest ownership percentage purchased by parent |
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16.00% |
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| Company's capital ownership interest at the end of the period |
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100.00% |
84.00% |
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Tax Advantaged Bond Strategies [Member]
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| Business Acquisition Contingent Consideration [Line Items] |
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| Contingent payment made during the period |
$ 12,300,000 |
$ 11,600,000 |
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