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INTANGIBLE ASSETS (Summary of Goodwill Balances by Reporting Segment) (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2013
Jun. 30, 2012
Intangible Assets [Line Items]          
Goodwill $ 561,406us-gaap_Goodwill $ 519,879us-gaap_Goodwill $ 517,065us-gaap_Goodwill $ 508,937us-gaap_Goodwill $ 549,961us-gaap_Goodwill
Medical and Healthcare          
Intangible Assets [Line Items]          
Goodwill 408,994us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dv_MedicalAndHealthcareMember
408,994us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dv_MedicalAndHealthcareMember
  408,994us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dv_MedicalAndHealthcareMember
462,088us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dv_MedicalAndHealthcareMember
Business, Technology and Management          
Intangible Assets [Line Items]          
Goodwill 22,196us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dv_BusinessTechnologyAndManagementMember
22,196us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dv_BusinessTechnologyAndManagementMember
  22,196us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dv_BusinessTechnologyAndManagementMember
22,196us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dv_BusinessTechnologyAndManagementMember
International and Professional Education          
Intangible Assets [Line Items]          
Goodwill $ 130,216us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dv_InternationalKTwelveAndProfessionalEducationMember
$ 88,689us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dv_InternationalKTwelveAndProfessionalEducationMember
  $ 77,747us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dv_InternationalKTwelveAndProfessionalEducationMember
$ 65,677us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dv_InternationalKTwelveAndProfessionalEducationMember