XML 70 R61.htm IDEA: XBRL DOCUMENT
v3.5.0.2

COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) - Letter of Credit $ in Millions | 3 Months Ended
--- | ---
Sep. 30, 2016 USD ($)
Letter Of Credit Title IV Percentage | 10.00%
Letter Of Credit Title IV Disbursement, Amount | $ 68.4
Letter Of Credit Provisional Certification Term | 5 years

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