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FINANCING RECEIVABLES - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Financing Receivables [Line Items]    
Term of loan, in months 18 months  
Number of days past due, to consider loans as nonperforming 120 days  
Impaired Financing Receivable, with Related Allowance, Recorded Investment $ 15.9us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment $ 10.3us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Nonperforming loan    
Financing Receivables [Line Items]    
Impaired Financing Receivable, Related Allowance 17.6us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_NonperformingFinancingReceivableMember
15.8us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_NonperformingFinancingReceivableMember
Accounts Receivable    
Financing Receivables [Line Items]    
Net Institutional Student Loans, classified as Accounts Receivable 18.9us-gaap_NotesAndLoansReceivableNetCurrent
/ dv_BalanceSheetLocationsAxis
= us-gaap_AccountsReceivableMember
19.5us-gaap_NotesAndLoansReceivableNetCurrent
/ dv_BalanceSheetLocationsAxis
= us-gaap_AccountsReceivableMember
Other Assets    
Financing Receivables [Line Items]    
Net Institutional Student Loans, classified as Other Assets $ 29.1us-gaap_NotesAndLoansReceivableNetNoncurrent
/ dv_BalanceSheetLocationsAxis
= us-gaap_OtherAssetsMember
$ 24.7us-gaap_NotesAndLoansReceivableNetNoncurrent
/ dv_BalanceSheetLocationsAxis
= us-gaap_OtherAssetsMember
Minimum    
Financing Receivables [Line Items]    
Repayment plan, number of monthly installments 12 months  
Maximum    
Financing Receivables [Line Items]    
Repayment plan, number of monthly installments 60 months