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INTANGIBLE ASSETS (Schedule of Intangible Assets) (Parenthetical) (Detail) | 12 Months Ended
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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
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
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: |