Name:	mgln_DirectServiceCostsAndOtherOperatingExpenses
Namespace Prefix:	mgln_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the 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 and other revenues recognized during the reporting period.

No definition available.

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

Represents the revenue recognized for Pharmacy Benefit Management (PBM) Revenue and Dispensing Revenue. 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. Dispensing Revenue represents the revenue recognized, which includes the co-payments received from members of the health plans the company serves, when the specialty pharmaceutical drugs were shipped.

No definition available.

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

The add back of the change in the fair value of contingent consideration, (excluding the portion that is recorded as interest expense) that is included in direct service costs and other operating expenses but is excluded from the computation of segment profit since it is managed on a consolidated basis..

No definition available.

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

The noncontrolling portion of segment profit that is excluded from the computation of segment profit.

No definition available.

Name:	mgln_ReconciliationOfSegmentProfitLossNoncontrollingInterestProfitLoss
Namespace Prefix:	mgln_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The add back of stock compensation expense that is included in direct service costs and other operating expenses but is excluded from the computation of segment profit since it is managed on a consolidated basis.

No definition available.

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

Total costs related to goods produced and sold during the reporting period.

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 210.5-03.2(a))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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 210.5-03.1,2)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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

Total costs of health care costs, net of recoveries of stop-loss insurance. Costs of services rendered (including costs of services rendered but not yet reported).

No definition available.

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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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

Name:	us-gaap_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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

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