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COMMITMENTS (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract] |  |
Rental Expense | $ 732 | $ 764

X
- Definition Total estimated rental expense. + References No definition available. + Details
Name: | mgyr_RentalExpense
Namespace Prefix: | mgyr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration