Consolidated Sponsored Funds (Details) - USD ($) $ in Thousands |
Apr. 30, 2017 |
Oct. 31, 2016 |
|---|---|---|
| Schedule Of Consolidated Funds [Line Items] | ||
| Investments | $ 750,121 | $ 589,773 |
| Other assets | 56,428 | 85,565 |
| Other liabilities | (107,504) | (75,069) |
| Redeemable non-controlling interests | (200,114) | (109,028) |
| Consolidated Sponsored Funds [Member] | ||
| Schedule Of Consolidated Funds [Line Items] | ||
| Investments | 424,440 | 248,036 |
| Other assets | 11,700 | 10,984 |
| Other liabilities | (46,599) | (23,947) |
| Redeemable non-controlling interests | (122,006) | (24,474) |
| Interest in consolidated sponsored funds | $ 267,535 | $ 210,599 |