Name:	mdvn_LeasesFutureMinimumPaymentsDue
Namespace Prefix:	mdvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

No definition available.

Name:	mdvn_LeasesFutureMinimumPaymentsDueCurrent
Namespace Prefix:	mdvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of required minimum rental payments maturing in the fifth fiscal year following the latest fiscal year for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

No definition available.

Name:	mdvn_LeasesFutureMinimumPaymentsDueInFiveYears
Namespace Prefix:	mdvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

No definition available.

Name:	mdvn_LeasesFutureMinimumPaymentsDueInFourYears
Namespace Prefix:	mdvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

No definition available.

Name:	mdvn_LeasesFutureMinimumPaymentsDueInThreeYears
Namespace Prefix:	mdvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

No definition available.

Name:	mdvn_LeasesFutureMinimumPaymentsDueInTwoYears
Namespace Prefix:	mdvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of required minimum rental payments maturing after the fifth fiscal year following the latest fiscal year for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

No definition available.