DISCONTINUED OPERATIONS - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
Dec. 31, 2014
Assets Sale Price On Divestiture Of Businesses	$ 2.0

The cash inflow associated with the amount received from the sale of assets on divestiture of businesses.

No definition available.

Name:	dv_AssetsSalePriceOnDivestitureOfBusinesses
Namespace Prefix:	dv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration