Name:	mgln_DispensingRevenue
Namespace Prefix:	mgln_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the minimum number of contracts entered by the entity per customer.

No definition available.

Name:	mgln_MinimumNumberOfContracts
Namespace Prefix:	mgln_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Number of contracts.

No definition available.

Name:	mgln_NumberOfContracts
Namespace Prefix:	mgln_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of members receiving behavioral healthcare management and other related services.

No definition available.

Name:	mgln_NumberOfMembers
Namespace Prefix:	mgln_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

PBM Revenue represents the revenue earned by the entity which consists of negotiated prescription price (ingredient cost plus dispensing fee), co-payments collected by the pharmacy and any associated administrative fees.

No definition available.

Name:	mgln_PharmacyBenefitManagementRevenue
Namespace Prefix:	mgln_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the revenue earned by the entity which is based upon the volume of rebates generated for its clients.

No definition available.

Name:	mgln_RebateRevenues
Namespace Prefix:	mgln_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The number of days required for a customer to have the right to terminate a contract for cause.

No definition available.

Name:	mgln_TerminationClauseNumberOfDaysNoticeToTerminate
Namespace Prefix:	mgln_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the number of days required for a customer to have the right to terminate a contract without cause after January 1, 2014.

No definition available.

Name:	mgln_TerminationClauseNumberOfDaysNoticeToTerminateWithoutCause
Namespace Prefix:	mgln_
Data Type:	xbrli:durationItemType
Balance Type:	na
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Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product.

Name:	us-gaap_ContractsRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Name:	us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of revenues recognized from services provided to residents in facilities owned or operated by the health care organization (not including patient service revenue), which may be based on contractual rates set forth in agreements with third-party payers.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 954

-SubTopic 605

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35755891&loc=d3e8184-115640

Name:	us-gaap_HealthCareOrganizationResidentServiceRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Revenue for operating and managing another entity's business during the reporting period which is based on meeting certain operating or revenue metrics (for example: occupancy or vacancy rates, profitability or expense targets), or otherwise meant to incentivize the operator other than by guaranteed or minimum compensation.

Name:	us-gaap_ManagementFeesIncentiveRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Revenue earned during the period from non-repayable sum of money awarded to an entity to carry out a specific purpose as provided in grant agreements.

Name:	us-gaap_RevenueFromGrants
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Name:	us-gaap_RevenuesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_MajorCustomersAxis=mgln_FloridaContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_MajorCustomersAxis=mgln_FloridaMedicaidContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_MajorCustomersAxis=mgln_IowaContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_MajorCustomersAxis=mgln_IowaMedicaidContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_MajorCustomersAxis=mgln_IowaMedicaidIntegratedHealthHomeProviderAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_MajorCustomersAxis=mgln_MaricopaCountyRegionalBehavioralHealthAuthorityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementBusinessSegmentsAxis=mgln_CommercialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementBusinessSegmentsAxis=mgln_PharmacySolutionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: