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Subsequent Events - Additional Information (Detail)	1 Months Ended
	Feb. 28, 2022 Air-craft
Forward Purchase Contract [Member] | VTOL [Member] | Forecast [Member] | Aircraft Purchase Agreement [Member]
Subsequent Event [Line Items]
Number of aircraft purchased	100

X

- Definition

Number of aircraft purchased.

+ References

No definition available.

+ Details

Name:	mesa_NumberOfAircraftPurchased
Namespace Prefix:	mesa_
Data Type:	xbrli:integerItemType
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:	us-gaap_TypeOfArrangementAxis=mesa_ForwardPurchaseContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mesa_VerticalTakeoffAndLandingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongTermContractForPurchaseOfElectricPowerAxis=mesa_AircraftPurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: