Name:	ev_CarryingAndFairValueConsolidatedCloEntitiesLineItems
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The fair value amount that would be paid, determined under the conditions specified in the contract of a Consolidated Variable Interest Entity, if as of the reporting date, the holder of the share has the right to redeem the shares.

+ References

No definition available.

+ Details

Name:	ev_FairValueOfSharesSubjectToMandatoryRedemptionSettlementTermsAmountConsolidatedVariableInterestEntity
Namespace Prefix:	ev_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value at the balance sheet date of borrowings by a Consolidated Variable Interest Entity from a bank, not elsewhere enumerated in the taxonomy, with a maturity within one year (or within one operating cycle if longer) from the date of borrowing.

+ References

No definition available.

+ Details

Name:	ev_FairValueOfShortTermBankLoansAndNotesPayableConsolidatedVariableInterestEntity
Namespace Prefix:	ev_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The line of credit is a non-recourse revolving facility that is being used to fund purchases of portfolio investments (floating-rate bank loans) for Eaton Vance CLO 2013-1 during the warehouse phase of the entity. The debt is recorded on the Company's Balance Sheet at its carrying value which approximates fair value.

+ References

No definition available.

+ Details

Name:	ev_LineOfCreditClo2013Consolidated
Namespace Prefix:	ev_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The line of credit effective interest rate at the end of the reporting period.

+ References

No definition available.

+ Details

Name:	ev_LineOfCreditFacilityConsolidatedVariableInterestEntityInterestRateAtPeriodEnd
Namespace Prefix:	ev_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Residual interest in a consolidated variable interest entity attributable to the redeemable noncontrolling interest as a result of a change in the redemption value in a consolidated variable interest entity.

+ References

No definition available.

+ Details

Name:	ev_MinorityInterestChangeInRedemptionValueConsolidatedVariableInterestEntity
Namespace Prefix:	ev_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

As of the reporting date, the par value of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of preferred shares (regardless of class), preferred partnership units (regardless of class), preferential membership interests, or any other form of preferred equity regardless of investee entity legal form.

+ References

No definition available.

+ Details

Name:	ev_RedeemableNoncontrollingInterestConsolidatedVariableInterestEntityEquityPreferredParValue
Namespace Prefix:	ev_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount that would be paid, determined under the conditions specified in the contract of a Consolidated Variable Interest Entity, if as of the reporting date, the holder of the share has the right to redeem the shares.

+ References

No definition available.

+ Details

Name:	ev_SharesSubjectToMandatoryRedemptionSettlementTermsAmountConsolidatedVariableInterestEntity
Namespace Prefix:	ev_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Fair Value Measurements of Other Financial Instruments of Consolidated CLO entities (Details) (USD $)	12 Months Ended
	Oct. 31, 2013	Oct. 31, 2014	Jan. 31, 2014
Carrying And Fair Value Consolidated Clo Entities [Line Items]
Line of credit	$ 247,789,000ev_LineOfCreditClo2013Consolidated	$ 0ev_LineOfCreditClo2013Consolidated
Redeemable preferred shares	64,952,000	0	65,400,000
Line of credit effective interest rate	1.57%
Par value of redeemable preferred shares	60,000,000
Residual interest	4,900,000
Level 2 [Member]
Carrying And Fair Value Consolidated Clo Entities [Line Items]
Fair value of line of credit	247,789,000
Level 3 [Member]
Carrying And Fair Value Consolidated Clo Entities [Line Items]
Fair value of redeemable preferred shares	$ 64,952,000