Special Charges (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)
Special Charges
Special charges	$ 8,309	$ 8,309
Transformation initiative liabilities	$ 9,600	$ 9,600

The amount special charges incurred as result of transformation initiative arising out of any lease termination or abandonments.

No definition available.

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