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RESTRUCTURING CHARGES (Separation and Restructuring Plan Activity) (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Mar. 31, 2015
Jun. 30, 2014
Restructuring Cost and Reserve [Line Items]    
Liability beginning balance $ 21.3us-gaap_RestructuringReserve $ 13.2us-gaap_RestructuringReserve
Increase in liability (separation and other charges) 26.3us-gaap_RestructuringReservePeriodIncreaseDecrease 30.0us-gaap_RestructuringReservePeriodIncreaseDecrease
Reduction in liability (payments and adjustments) (19.0)dv_RestructuringReservePaymentsAndAdjustment (21.9)dv_RestructuringReservePaymentsAndAdjustment
Liability ending balance $ 28.6us-gaap_RestructuringReserve $ 21.3us-gaap_RestructuringReserve