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Subsequent Events - Additional Information (Detail) - Forward Purchase Contract [Member] - Heart Aerospace Incorporated [Member] - Subsequent Event [Member] $ in Millions | 1 Months Ended
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Jul. 31, 2021 USD ($) Air-craft
Aircraft Purchase Agreement [Member] |
Subsequent Event [Line Items] |
Number of aircraft purchased | 100
Number of additional aircrafts | 50
Preferred Stock [Member] | Series A Preferred Stock Purchase Agreement [Member] |
Subsequent Event [Line Items] |
Purchase of preferred stock | $ | $ 5.0

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- Definition Number of additional aircraft. + References No definition available. + Details
Name: | mesa_NumberOfAdditionalAircraft
Namespace Prefix: | mesa_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- 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

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- Definition Value of shares of stock issued during the period as part of a transaction to acquire assets that do not qualify as a business combination. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=mesa_HeartAerospaceIncorporatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_PreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongTermContractForPurchaseOfElectricPowerAxis=mesa_SeriesAPreferredStockPurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |