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STOCK-BASED COMPENSATION (Fair Values of Stock Option Awards Weighted Average Assumptions) (Detail)
12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected Life (in Years) 6 years 8 months 23 days 6 years 6 months 29 days
Expected Volatility 42.04%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate 43.76%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Risk-free Interest Rate 2.03%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate 2.16%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Dividend Yield 1.03%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate 0.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Pre-vesting Forfeiture Rate 3.00%dv_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsPreVestingForfeitureRate 3.00%dv_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsPreVestingForfeitureRate