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COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2016
Inquiry Settlement | $ 2,250 | $ 2,250
Inquiry Settlement Penalties | 500 | 500
Permanent Injunction And Monetary Judgment Agreement [Member] |  |
Forgivable Of Loan | 30,400 | 30,400
Forgiveable Of Account Receivable | 20,200 | 20,200
Settlement Payment | 49,400 | $ 49,400
Letter of Credit |  |
Letter Of Credit Title IV Percentage |  | 10.00%
Letter Of Credit Title IV Disbursement, Amount | $ 68,400 | $ 68,400
Letter Of Credit Provisional Certification Term |  | 5 years

X
- Definition This element represents the amount of loan forgiven. + References No definition available. + Details
Name: | dv_ForgivableOfLoan
Namespace Prefix: | dv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represent the amount of account receivable forgivable during the period. + References No definition available. + Details
Name: | dv_ForgiveableOfAccountReceivable
Namespace Prefix: | dv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of settlement awarded to (against) the entity in respect of inquiry. + References No definition available. + Details
Name: | dv_InquirySettlement
Namespace Prefix: | dv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amounts of inquiry settlement penalties. + References No definition available. + Details
Name: | dv_InquirySettlementPenalties
Namespace Prefix: | dv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the provisional certification term. + References No definition available. + Details
Name: | dv_LetterOfCreditProvisionalCertificationTerm
Namespace Prefix: | dv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Its represent the amount of letter of credit disbursements. + References No definition available. + Details
Name: | dv_LetterOfCreditTitleIvDisbursementAmount
Namespace Prefix: | dv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the percentage of letter of credit title iv percentage. + References No definition available. + Details
Name: | dv_LetterOfCreditTitleIvPercentage
Namespace Prefix: | dv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cash settlment made during the period. + References No definition available. + Details
Name: | dv_SettlementPayment
Namespace Prefix: | dv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=dv_PermanentInjunctionAndMonetaryJudgmentAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortTermDebtTypeAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |