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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: