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Subsequent Events (Details) $ in Millions	3 Months Ended
	Dec. 31, 2023 USD ($)
Subsequent Event | Chief Executive Officer | Forecast
Subsequent Event [Line Items]
Expense related to termination of executive officer	$ 2.6

X

- Definition

Compensation Expense, Excluding Cost Of Good and Service Sold, Termination Of Executive Officer

+ References

No definition available.

+ Details

Name:	mg_CompensationExpenseExcludingCostOfGoodAndServiceSoldTerminationOfExecutiveOfficer
Namespace Prefix:	mg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483399/855-10-50-2

+ Details

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Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
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X

- Details

Name:	srt_TitleOfIndividualAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
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Period Type: