XML 173 R39.htm IDEA: XBRL DOCUMENT
v3.25.1

Organization and Operations - Additional Information 1 (Detail) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 20, 2019 AirCraft | Sep. 30, 2024 USD ($) AirCraft | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Mar. 15, 2024 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Number of aircrafts operated | AirCraft |  | 67 |  |  |
Wind-down and associated cost | $ |  |  |  |  | $ 1,000
United capacity purchase agreement termination notice period |  | 30 days |  |  |
Purcahse of aircraft | $ |  | $ 20,313 | $ 36,641 | $ 40,814 |
Boeing 737400F [Member] | DHL Flight Services Agreement [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Number of aircrafts operated | AirCraft | 4 |  |  |  |
E175LL Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Notice period for termination of agreement |  | United, subject to certain conditions, including the payment of certain costs tied to aircraft type, may terminate the agreement in its discretion, or remove E-175 aircraft from service, by giving us notice of 90 days or more |  |  |

X
- Definition Notice period for termination of agreement. + References No definition available. + Details
Name: | mesa_NoticePeriodForTerminationOfAgreement
Namespace Prefix: | mesa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Organization consolidation and presentation of financial statements. + References No definition available. + Details
Name: | mesa_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems
Namespace Prefix: | mesa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition United capacity purchase agreement termination notice period. + References No definition available. + Details
Name: | mesa_UnitedCapacityPurchaseAgreementTerminationNoticePeriod
Namespace Prefix: | mesa_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Wind-down and associated cost. + References No definition available. + Details
Name: | mesa_WindDownAndAssociatedCost
Namespace Prefix: | mesa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of aircraft operated by the carrier. + References No definition available. + Details
Name: | us-gaap_NumberOfAircraftOperated
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480060/805-50-25-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 30 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480027/805-50-30-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 30 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480027/805-50-30-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
Name: | us-gaap_PaymentsToAcquireProductiveAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_AircraftTypeAxis=mesa_Boeing737400FMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=mesa_FlightServicesAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_AircraftTypeAxis=mesa_E175LLAircraftMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=mesa_UnitedCapacityPurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=mesa_UnitedAirlinesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |