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Investment Securities, Trading (Details) (USD $)
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3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
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Apr. 30, 2013
Number
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Apr. 30, 2012
Number
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Apr. 30, 2013
Number
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Apr. 30, 2012
Number
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Oct. 31, 2012
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| Schedule Of Trading Securities And Other Trading Assets [Line Items] | |||||
| Total investment securities, trading | $ 285,021,000 | $ 285,021,000 | $ 190,253,000 | ||
| Trading securities net unrealized gain | 6,400,000 | 1,000,000 | 15,900,000 | 6,800,000 | |
| Number of seeded sponsored funds | 9 | 13 | 9 | 13 | |
| Number of seeded separately managed accounts | 14 | 3 | 14 | 3 | |
|
Equity Securities [Member]
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|||||
| Schedule Of Trading Securities And Other Trading Assets [Line Items] | |||||
| Total investment securities, trading | 186,796,000 | 186,796,000 | 119,448,000 | ||
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Debt Securities [Member]
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|||||
| Schedule Of Trading Securities And Other Trading Assets [Line Items] | |||||
| Total investment securities, trading | $ 98,225,000 | $ 98,225,000 | $ 70,805,000 | ||