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SEGMENT INFORMATION - Additional Information (Detail)
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Revenue, Major Customer [Line Items]      
Percentage of other international revenues generated from Europe and Canada 5.00%us-gaap_ConcentrationRiskPercentage1 5.00%us-gaap_ConcentrationRiskPercentage1  
Maximum | Entity Wide Revenue Major Customers      
Revenue, Major Customer [Line Items]      
Percentage of other international revenues generated from Europe and Canada     10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= dv_EntityWideRevenueMajorCustomersMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember