Investments (Details) - USD ($)
$ in Thousands |
Oct. 31, 2016 |
Oct. 31, 2015 |
| Schedule Of Investments [Line Items] |
|
|
| Investments |
$ 589,773
|
$ 507,020
|
| Total investment securities, trading |
413,541
|
330,649
|
| Equity Securities [Member] |
|
|
| Schedule Of Investments [Line Items] |
|
|
| Total investment securities, trading |
136,031
|
116,295
|
| Debt Securities [Member] |
|
|
| Schedule Of Investments [Line Items] |
|
|
| Total investment securities, trading |
191,688
|
136,959
|
| Trading Account Assets [Member] |
|
|
| Schedule Of Investments [Line Items] |
|
|
| Total investment securities, trading |
413,541
|
330,649
|
| Short Term Debt Securities[Member] | Trading Account Assets [Member] |
|
|
| Schedule Of Investments [Line Items] |
|
|
| Investments |
85,822
|
77,395
|
| Consolidated Sponsored Funds [Member] | Trading Account Assets [Member] |
|
|
| Schedule Of Investments [Line Items] |
|
|
| Investments |
248,036
|
196,395
|
| Separately Managed Accounts [Member] | Trading Account Assets [Member] |
|
|
| Schedule Of Investments [Line Items] |
|
|
| Investments |
79,683
|
56,859
|
| Available-for-sale Securities [Member] |
|
|
| Schedule Of Investments [Line Items] |
|
|
| Investments |
13,312
|
25,720
|
| Investments in non-consolidated CLO entities [Member] |
|
|
| Schedule Of Investments [Line Items] |
|
|
| Investments |
3,837
|
4,363
|
| Equity Method Investments [Member] |
|
|
| Schedule Of Investments [Line Items] |
|
|
| Investments |
139,929
|
144,137
|
| Cost Method Investments [Member] |
|
|
| Schedule Of Investments [Line Items] |
|
|
| Investments |
$ 19,154
|
$ 2,151
|