Intangible Assets (Schedule of Amortizable Intangible Assets Amortized At Annual Rate - FBV) (Details) (Faculdade Boa Viagem [Member])	9 Months Ended
Mar. 31, 2012
Faculdade Boa Viagem [Member]
Intangible Assets [Line Items]
2012	11.94%
2013	33.65%
2014	25.89%
2015	16.70%
2016	9.02%
2017	2.64%
2018	0.17%

Finite lived intangible assets amortized at annual rate, year five.

No definition available.

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Finite lived intangible assets amortized at annual rate, year four.

No definition available.

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Finite lived intangible assets amortized at annual rate, year one.

No definition available.

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Finite lived intangible assets amortized at annual rate, year seven.

No definition available.

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Finite lived intangible assets amortized at annual rate, year six.

No definition available.

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Finite lived intangible assets amortized at annual rate, year three.

No definition available.

Name:	dv_FiniteLivedIntangibleAssetsAmortizedAtAnnualRateYearThree
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Finite lived intangible assets amortized at annual rate, year two.

No definition available.

Name:	dv_FiniteLivedIntangibleAssetsAmortizedAtAnnualRateYearTwo
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