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Subsequent Events - Additional Information (Detail)	1 Months Ended
	Apr. 30, 2022
Maximum [Member] | Treasury Loan [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Minimum collateral coverage ratio covenant	1.5

X

- Definition

Minimum collateral coverage ratio covenant.

+ References

No definition available.

+ Details

Name:	mesa_MinimumCollateralCoverageRatioCovenant
Namespace Prefix:	mesa_
Data Type:	xbrli:pureItemType
Balance Type:	na
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

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

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis=mesa_TreasuryLoanMember
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: