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DIVIDENDS AND SHARE REPURCHASE PROGRAMS (Shares Repurchased under Programs) (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Mar. 31, 2015
Authorized on November 15, 2006  
Share Repurchases [Line Items]  
Shares Repurchased 908,399us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= dv_AuthorizedOnNovemberFifteenTwoThousandSixMember
Total Cost $ 35.0us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= dv_AuthorizedOnNovemberFifteenTwoThousandSixMember
Authorized on May 13, 2008  
Share Repurchases [Line Items]  
Shares Repurchased 1,027,417us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= dv_AuthorizedOnMayThirteenTwoThousandEightMember
Total Cost 50.0us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= dv_AuthorizedOnMayThirteenTwoThousandEightMember
Authorized on November 11, 2009  
Share Repurchases [Line Items]  
Shares Repurchased 972,205us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= dv_AuthorizedOnNovemberElevenTwoThousandNineMember
Total Cost 50.0us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= dv_AuthorizedOnNovemberElevenTwoThousandNineMember
Authorized on August 11, 2010  
Share Repurchases [Line Items]  
Shares Repurchased 1,103,628us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= dv_AuthorizedOnAugustElevenTwoThousandTenMember
Total Cost 50.0us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= dv_AuthorizedOnAugustElevenTwoThousandTenMember
Authorized on November 10, 2010  
Share Repurchases [Line Items]  
Shares Repurchased 968,105us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= dv_AuthorizedOnNovemberTenTwoThousandTenMember
Total Cost 50.0us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= dv_AuthorizedOnNovemberTenTwoThousandTenMember
Authorized on May 20, 2011  
Share Repurchases [Line Items]  
Shares Repurchased 2,396,143us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= dv_AuthorizedOnMayTwentyTwoThousandElevenMember
Total Cost 100.0us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= dv_AuthorizedOnMayTwentyTwoThousandElevenMember
Authorized on November 2, 2011  
Share Repurchases [Line Items]  
Shares Repurchased 3,478,299us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= dv_AuthorizedOnNovemberSecondTwoThousandElevenMember
Total Cost 100.0us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= dv_AuthorizedOnNovemberSecondTwoThousandElevenMember
Authorized On August 29, 2012  
Share Repurchases [Line Items]  
Shares Repurchased 1,162,440us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= dv_AuthorizedOnAugustTwentyNineTwoThousandTweleveMember
Total Cost 38.9us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= dv_AuthorizedOnAugustTwentyNineTwoThousandTweleveMember
Stock Repurchase Programs Total [Member]  
Share Repurchases [Line Items]  
Shares Repurchased 12,016,636us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= dv_StockRepurchaseProgramsTotalMember
Total Cost $ 473.9us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= dv_StockRepurchaseProgramsTotalMember