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INTANGIBLE ASSETS (Schedule of Intangible Assets) (Parenthetical) (Detail)	12 Months Ended
	Jun. 30, 2016
Faculdade Boa Viagem [Member]
Intangible Assets [Line Items]
Amortizable Intangible Assets, Weighted Average Amortization Period (in years)	6 years
Centro Universitario do Vale do Ipojuca [Member]
Intangible Assets [Line Items]
Amortizable Intangible Assets, Weighted Average Amortization Period (in years)	5 years
Damasio [Member]
Intangible Assets [Line Items]
Amortizable Intangible Assets, Weighted Average Amortization Period (in years)	6 years
Grupo Ibmec [Member]
Intangible Assets [Line Items]
Amortizable Intangible Assets, Weighted Average Amortization Period (in years)	5 years

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dv_FaculdadeBoaViagemMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dv_CentroUniversitarioDoValeDoIpojucaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dv_DamasioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dv_GrupoIbmecMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: