XML 72 R62.htm IDEA: XBRL DOCUMENT v3.23.1

Subsequent Events (Details) - Litigation and Commercial Claims - Subsequent Event - Various Pipeline Projects for Texas Customer - Texas Customer $ in Millions	Apr. 25, 2023 USD ($)
Subsequent Event [Line Items]
Settlement liability	$ 0.3
Damages no longer sought	$ 1.4

X

- Definition

Loss Contingency, Damages No Longer Sought, Value

+ References

No definition available.

+ Details

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

X

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

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

X

- 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

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_LitigationCaseAxis=mg_VariousPipelineProjectsForTexasCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MajorCustomersAxis=mg_TexasCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: