SEGMENT INFORMATION (Revenues and Long-Lived Assets by Geographic Area) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Unaffiliated Customers	$ 124,153us-gaap_Revenues	$ 116,198us-gaap_Revenues	$ 369,720us-gaap_Revenues	$ 339,992us-gaap_Revenues
Consolidated Revenue from Unaffiliated Customers	489,830us-gaap_SalesRevenueNet	496,117us-gaap_SalesRevenueNet	1,436,754us-gaap_SalesRevenueNet	1,438,298us-gaap_SalesRevenueNet
Long-lived Assets	234,096us-gaap_NoncurrentAssets	216,664us-gaap_NoncurrentAssets	234,096us-gaap_NoncurrentAssets	216,664us-gaap_NoncurrentAssets
Long-lived Assets of Business Held for Sale	594,349	598,807	594,349	598,807
Domestic Operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Unaffiliated Customers	365,677	379,919	1,067,034	1,098,306
Long-lived Assets	360,253	382,143	360,253	382,143
Dominica and St. Kitts, St. Maarten
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Unaffiliated Customers	85,144	85,798	257,590	247,694
Long-lived Assets	182,975	168,171	182,975	168,171
Brazil
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Unaffiliated Customers	37,503	27,018	106,930	83,444
Long-lived Assets	48,973	46,486	48,973	46,486
Other International Operations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Unaffiliated Customers	1,506	3,382	5,200	8,854
Long-lived Assets	$ 2,148	$ 2,007	$ 2,148	$ 2,007

Amount classified as long lived assets attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2510-110228

+ Details

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 41

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

+ Details

Name:	us-gaap_NoncurrentAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

+ Details

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_SegmentReportingRevenueReconcilingItemLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementGeographicalAxis=dv_BrazilMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=dv_DomesticOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=dv_DominicaAndSTKittsNevisMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=dv_OtherInternationalOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: