Name:	ev_TotalVariableInterestInConsolidatedSecuritizedCloEntitiesEqualToTheNetCarryingAmount
Namespace Prefix:	ev_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The percent of equity interest in a collateralized loan obligation entity held by the Company.

No definition available.

Name:	ev_VariableInterestEntityEquityInterestPercentage
Namespace Prefix:	ev_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The percent of equity interest the Company purchased in a collateralized loan obligation entity.

No definition available.

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

The loss recorded in gains and other investment income, net, on the Company's consolidated Statement of Income as a result of the sale of the Company's equity interest in a collateralized loan obligation entity.

No definition available.

Name:	ev_VariableInterestEntityLossOnDisposalOfEquityInterestInVariableInterestEntity
Namespace Prefix:	ev_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The cash inflow from the sale of the Company's equity interest in a collateralized loan obligation entity.

No definition available.

Name:	ev_VariableInterestEntityProceedsFromSaleOfVariableInterestEntityEquityInterest
Namespace Prefix:	ev_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=ev_EatonVanceClo20131Member
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Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=ev_EatonVanceClo20191Member
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=ev_EatonVanceClo20181Member
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=ev_EatonVanceClo20141rMember
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Data Type:	na
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