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FAIR VALUE MEASUREMENTS (Roll-Forward of Assets and Liabilities Measured at Fair Value using Level Three Inputs) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Fair Value, Assets and liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at Beginning of Period $ 2,519us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue $ 2,509us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Total Realized Gains (Losses) Included in Income:    
Foreign Currency Translation Changes (148)dv_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitiesForeignCurrencyTranslation (138)dv_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitiesForeignCurrencyTranslation
Balance at End of Period $ 2,371us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue $ 2,371us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue