Principles of Consolidation	9 Months Ended
Jul. 31, 2013
Principles Of Consolidation Disclosure [Abstract]
Principles of Consolidation	2. Principles of Consolidation The Consolidated Financial Statements include the accounts of the Company and its controlled affiliates. The Company consolidates any voting interest entity in which the Company's ownership exceeds 50 percent or where the Company has control. In addition, the Company consolidates any variable interest entity (“VIE”) (including the collateralized loan obligation (“CLO”) entity referred to in Note 9) for which the Company is considered the primary beneficiary. The Company recognizes non-controlling and other beneficial interests in consolidated affiliates in which the Company's ownership is less than 100 percent. All intercompany accounts and transactions have been eliminated in consolidation. From time to time, the Company may maintain a controlling interest in an Eaton Vance open-end registered investment company (a “sponsored fund”). Upon consolidation, the Company retains the specialized accounting treatment of the sponsored fund. Under the specialized accounting guidance for investment companies, underlying investments held by consolidated sponsored funds are carried at fair value, with corresponding changes in fair value reflected in gains and other investment income, net, in the Company's Consolidated Statements of Income. With limited exceptions, each of the Company's sponsored funds is organized as a separately managed component (or “series”) of a series trust. All assets of a series irrevocably belong to that series and are subject to the liabilities of that series; under no circumstances are the liabilities of one series payable by another series. Series trusts themselves have no equity investment at risk, but decisions regarding the trustees of the trust and certain key activities of each sponsored fund within the trust, such as appointment of each sponsored fund's investment adviser, typically reside at the trust level. As a result, shareholders of a sponsored fund that is organized as a series of a series trust lack the ability to control the key decision-making processes that most directly affect the performance of the sponsored fund. Accordingly, the Company believes that each trust is a VIE and each sponsored fund is a silo of a VIE that also meets the definition of a VIE. Having concluded that each silo is a VIE, the primary beneficiary evaluation defaults to an analysis of economic interest. The Company typically holds the majority of the shares of a sponsored fund corresponding to a majority economic interest during the seed investment stage when the fund's investment track record is being established or when the fund is in the early stages of soliciting third-party investors. The Company consolidates the fund as primary beneficiary during this period. While the sponsored fund is consolidated, fee revenue is recorded, but is eliminated in consolidation. The Company regularly seeds new sponsored funds and therefore may consolidate a variety of sponsored funds during a given reporting period. Due to the similarity of risks related to the Company's involvement with each sponsored fund, disclosures required under the VIE model are aggregated, such as those disclosures regarding the carrying amount and classification of assets of the sponsored funds, and the gains and losses that the Company recognizes from the sponsored funds. When the Company is no longer deemed to control a sponsored fund, typically when either the Company redeems its shares or shares held by third parties exceed the number of shares held by the Company, the Company deconsolidates the sponsored fund and removes the related assets, liabilities and non-controlling interests from balance sheet accounts and classifies the Company's remaining investment as either an equity method investment or an available-for-sale investment as applicable. Because consolidated sponsored funds utilize fair-value measurements, there is no incremental gain or loss recognized upon deconsolidation. The extent of the Company's exposure to loss with respect to a consolidated sponsored fund is the amount of the Company's investment in the sponsored fund. The Company is not obligated to provide financial support to sponsored funds, and the assets of sponsored funds can only be used to settle obligations of the sponsored funds. Beneficial interest holders of sponsored funds do not have recourse to the general credit of the Company.

Principles of Consolidation

9 Months Ended

Jul. 31, 2013

Principles Of Consolidation Disclosure [Abstract]

2. Principles of Consolidation

The Consolidated Financial Statements include the accounts of the Company and its controlled affiliates. The Company consolidates any voting interest entity in which the Company's ownership exceeds 50 percent or where the Company has control. In addition, the Company consolidates any variable interest entity (“VIE”) (including the collateralized loan obligation (“CLO”) entity referred to in Note 9) for which the Company is considered the primary beneficiary. The Company recognizes non-controlling and other beneficial interests in consolidated affiliates in which the Company's ownership is less than 100 percent. All intercompany accounts and transactions have been eliminated in consolidation.

From time to time, the Company may maintain a controlling interest in an Eaton Vance open-end registered investment company (a “sponsored fund”). Upon consolidation, the Company retains the specialized accounting treatment of the sponsored fund. Under the specialized accounting guidance for investment companies, underlying investments held by consolidated sponsored funds are carried at fair value, with corresponding changes in fair value reflected in gains and other investment income, net, in the Company's Consolidated Statements of Income.

With limited exceptions, each of the Company's sponsored funds is organized as a separately managed component (or “series”) of a series trust. All assets of a series irrevocably belong to that series and are subject to the liabilities of that series; under no circumstances are the liabilities of one series payable by another series. Series trusts themselves have no equity investment at risk, but decisions regarding the trustees of the trust and certain key activities of each sponsored fund within the trust, such as appointment of each sponsored fund's investment adviser, typically reside at the trust level. As a result, shareholders of a sponsored fund that is organized as a series of a series trust lack the ability to control the key decision-making processes that most directly affect the performance of the sponsored fund. Accordingly, the Company believes that each trust is a VIE and each sponsored fund is a silo of a VIE that also meets the definition of a VIE. Having concluded that each silo is a VIE, the primary beneficiary evaluation defaults to an analysis of economic interest. The Company typically holds the majority of the shares of a sponsored fund corresponding to a majority economic interest during the seed investment stage when the fund's investment track record is being established or when the fund is in the early stages of soliciting third-party investors. The Company consolidates the fund as primary beneficiary during this period. While the sponsored fund is consolidated, fee revenue is recorded, but is eliminated in consolidation.

The Company regularly seeds new sponsored funds and therefore may consolidate a variety of sponsored funds during a given reporting period. Due to the similarity of risks related to the Company's involvement with each sponsored fund, disclosures required under the VIE model are aggregated, such as those disclosures regarding the carrying amount and classification of assets of the sponsored funds, and the gains and losses that the Company recognizes from the sponsored funds.

When the Company is no longer deemed to control a sponsored fund, typically when either the Company redeems its shares or shares held by third parties exceed the number of shares held by the Company, the Company deconsolidates the sponsored fund and removes the related assets, liabilities and non-controlling interests from balance sheet accounts and classifies the Company's remaining investment as either an equity method investment or an available-for-sale investment as applicable. Because consolidated sponsored funds utilize fair-value measurements, there is no incremental gain or loss recognized upon deconsolidation.

The extent of the Company's exposure to loss with respect to a consolidated sponsored fund is the amount of the Company's investment in the sponsored fund. The Company is not obligated to provide financial support to sponsored funds, and the assets of sponsored funds can only be used to settle obligations of the sponsored funds. Beneficial interest holders of sponsored funds do not have recourse to the general credit of the Company.