Name:	mdvn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableNumber
Namespace Prefix:	mdvn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Weighted average remaining contractual term for equity-based awards excluding options, vested and exercisable, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	mdvn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageRemainingContractualTerms
Namespace Prefix:	mdvn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The number of equity-based payment awards, excluding stock (or unit) options, that were exercised during the reporting period.

No definition available.

Name:	mdvn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod
Namespace Prefix:	mdvn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Weighted average exercise price for equity-based awards excluding options, exercised during the period.

No definition available.

Name:	mdvn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageExercisePrice
Namespace Prefix:	mdvn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Weighted average exercise price for equity-based awards excluding options, forfeited during the period.

No definition available.

Name:	mdvn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice
Namespace Prefix:	mdvn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Weighted average exercise price for equity-based awards excluding options, granted during the period

No definition available.

Name:	mdvn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice
Namespace Prefix:	mdvn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Number of outstanding equity-based payment awards other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan), vested and non-vested.

No definition available.

Name:	mdvn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingNumber
Namespace Prefix:	mdvn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Weighted average exercise price of vested and exercisable equity-based awards excluding options

No definition available.

Name:	mdvn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsExercisableWeightedAverageExercisePrice
Namespace Prefix:	mdvn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Weighted average exercise price of equity-based awards (other than options) outstanding at the end of the period.

No definition available.

Name:	mdvn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsOutstandingWeightedAverageExercisePrice
Namespace Prefix:	mdvn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

No definition available.

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

No definition available.

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901