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v3.22.0.1

Subsequent Events - Additional Information (Detail) | 1 Months Ended
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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: |