Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	497
Document Period End Date	dei_DocumentPeriodEndDate	Sep. 30, 2017
Entity Registrant Name	dei_EntityRegistrantName	VIRTUS OPPORTUNITIES TRUST
Entity Central Index Key	dei_EntityCentralIndexKey	0001005020
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Nov. 30, 2018
Document Effective Date	dei_DocumentEffectiveDate	Nov. 30, 2018
Prospectus Date	rr_ProspectusDate	Jan. 29, 2018
Virtus KAR Emerging Markets Small-Cap Fund \| Class A
Risk/Return:	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	VAESX
Virtus KAR Emerging Markets Small-Cap Fund \| Class C
Risk/Return:	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	VCESX
Virtus KAR Emerging Markets Small-Cap Fund \| Class I
Risk/Return:	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	VIESX
Virtus KAR Emerging Markets Small-Cap Fund \| Class T
Risk/Return:	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	VTESX
Virtus KAR International Small-Cap Fund \| Class A
Risk/Return:	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	VISAX
Virtus KAR International Small-Cap Fund \| Class C
Risk/Return:	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	VCISX
Virtus KAR International Small-Cap Fund \| Class I
Risk/Return:	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	VIISX
Virtus KAR International Small-Cap Fund \| Class R6
Risk/Return:	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	VRISX
Virtus KAR International Small-Cap Fund \| Class T
Risk/Return:	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	VXISX

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- Definition

The date the document was made available and submitted, in CCYY-MM-DD format. The date of submission, date of acceptance by the recipient, and the document effective date are all potentially different.

+ References

No definition available.

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The date when a document, upon receipt and acceptance, becomes officially effective, in CCYY-MM-DD format. Usually it is a system-assigned date time value, but it may be declared by the submitter in some cases.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word "Other".

+ References

No definition available.

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- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation 12B
-Number 240
-Section 12b
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The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation 12B
-Number 240
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- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

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- Definition

The date of the prospectus.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Form
-Number N-1A
-Chapter A
-Section 1
-Subsection a
-Paragraph 3

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- References

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