|
Investments (Details) (USD $)
In Thousands, unless otherwise specified |
Apr. 30, 2013
|
Oct. 31, 2012
|
|---|---|---|
| Schedule Of Investments [Line Items] | ||
| Investments | $ 542,058 | $ 486,933 |
| Total investment securities, trading | 285,021 | 190,253 |
|
Equity Securities [Member]
|
||
| Schedule Of Investments [Line Items] | ||
| Total investment securities, trading | 186,796 | 119,448 |
|
Debt Securities [Member]
|
||
| Schedule Of Investments [Line Items] | ||
| Total investment securities, trading | 98,225 | 70,805 |
|
Categories of Investments, Marketable Securities, Trading Securities [Member]
|
||
| Schedule Of Investments [Line Items] | ||
| Total investment securities, trading | 285,021 | 190,253 |
|
Consolidated Sponsored Funds [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member]
|
||
| Schedule Of Investments [Line Items] | ||
| Investments | 243,657 | 157,405 |
|
Separately Managed Accounts [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member]
|
||
| Schedule Of Investments [Line Items] | ||
| Investments | 41,364 | 32,848 |
|
Available-for-sale Securities [Member]
|
||
| Schedule Of Investments [Line Items] | ||
| Investments | 19,770 | 31,148 |
|
Collateralized Loan Obligations [Member]
|
||
| Schedule Of Investments [Line Items] | ||
| Investments | 314 | 350 |
|
Equity Method Investments [Member]
|
||
| Schedule Of Investments [Line Items] | ||
| Investments | 229,422 | 257,652 |
|
Cost Method Investments [Member]
|
||
| Schedule Of Investments [Line Items] | ||
| Investments | $ 7,531 | $ 7,530 |