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COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Operating Leases, Rent Expense	$ 80.0	$ 90.1	$ 87.1
Letter of Credit
Letter Of Credit Title IV Percentage	10.00%

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 rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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