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Subsequent Events - Additional Information (Detail) $ in Thousands |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 11, 2024 USD ($) AirCraft | Dec. 31, 2023 USD ($) | Dec. 01, 2023 USD ($) Engine | Oct. 01, 2023 USD ($) AirCraft Engine | Sep. 30, 2023 AirCraft | Dec. 31, 2022 USD ($) | Mar. 31, 2024 USD ($) Engine AirCraft | Sep. 30, 2023 USD ($) AirCraft | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Dec. 27, 2022 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additional revenue and liquidity |  |  |  |  |  |  |  |  | $ 10,400 |  |
Loan forgiven |  |  |  |  |  |  |  | $ (1,505) | $ (397) | $ 950 |
Number of aircrafts operated | AirCraft |  |  |  |  |  |  |  | 120 |  |  |
EDC Loan and MHIRJ Junior Note [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  |  |  |  |  |  | $ 27,200 |  |  |
American Airlines Inc. [Member] | EDC Loan and MHIRJ Junior Note [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | AirCraft |  |  |  |  |  |  |  | 3 |  |  |
RASPRO Aircraft Lease Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Buyout pricing |  |  |  |  |  | $ 25,000 |  |  |  |  |
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving loan |  |  |  |  |  |  |  |  |  |  | $ 10,500
CRJ-900 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | AirCraft |  |  |  |  |  |  |  | 7 |  |  |
CRJ-900 Aircraft [Member] | American Airlines Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  |  |  |  |  |  | $ 29,700 |  |  |
Proceeds from sale of asset |  |  |  |  |  |  |  | $ 2,400 |  |  |
CRJ-900 Aircraft [Member] | United Capacity Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts operated | AirCraft |  |  |  |  | 24 |  |  | 26 |  |  |
UST Loan [Member] | CRJ-900 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  |  |  |  |  |  | $ 21,000 |  |  |
Proceeds from sale of asset |  |  |  |  |  |  |  | $ 1,500 |  |  |
Impact Of Pilot Shortage and Attrition [Member] | RASPRO Aircraft Lease Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts operated | AirCraft |  |  |  |  |  |  |  | 15 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of surplus engines to be sold | Engine |  |  | 12 | 12 |  |  |  |  |  |  |
Additional revenue and liquidity | $ 63,500 |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | AirCraft | 4 |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  | $ 56,000 | $ 56,000 |  |  |  |  |  |  |
Payment of debt and liquidity to fund operations and current debt obligations |  |  | $ 40,000 | $ 40,000 |  |  |  |  |  |  |
Subsequent Event | American Airlines Inc. [Member] | EDC Loan and MHIRJ Junior Note [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | AirCraft |  |  |  | 4 |  |  |  |  |  |  |
Subsequent Event | Engine Purchase Commitment [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  |  | $ 11,500 |  |  |  |  |  |  |
Number of engines to be sold | Engine |  |  |  | 23 |  |  |  |  |  |  |
Subsequent Event | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of long term debt | $ 2,100 |  |  |  |  |  |  |  |  |  |
Subsequent Event | United Capacity Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additional revenue and liquidity | 63,500 |  |  |  |  |  |  |  |  |  |
Repayments of long term debt | $ 10,500 |  |  |  |  |  |  |  |  |  |
Subsequent Event | American Purchase Agreement [Member] | EDC Loan and MHIRJ Junior Note [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  |  | $ 600 |  |  |  |  |  |  |
Subsequent Event | CRJ-900 Aircraft [Member] | EDC Loan and MHIRJ Junior Note [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan forgiven |  |  |  | 5,000 |  |  |  |  |  |  |
Repayments of long term debt |  |  |  | 4,200 |  |  |  |  |  |  |
Proceeds from sale of asset |  |  |  | $ 600 |  |  |  |  |  |  |
Subsequent Event | CRJ-900 Aircraft [Member] | American Airlines Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | AirCraft |  |  |  | 4 |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  |  | $ 41,500 |  |  |  |  |  |  |
Proceeds from sale of asset |  |  |  | $ 5,700 |  |  |  |  |  |  |
Subsequent Event | CRJ-900 Aircraft [Member] | American Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | AirCraft |  |  |  | 4 |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  |  | $ 41,500 |  |  |  |  |  |  |
Proceeds from sale of asset |  |  |  | 5,700 |  |  |  |  |  |  |
Subsequent Event | CRJ-900 Aircraft [Member] | American Purchase Agreement [Member] | EDC Loan and MHIRJ Junior Note [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan forgiven |  |  |  | 5,000 |  |  |  |  |  |  |
Repayments of long term debt |  |  |  | $ 4,200 |  |  |  |  |  |  |
Subsequent Event | CF34-8C Aircraft [Member] | Engine Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of surplus engines to be sold | Engine |  |  | 12 |  |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  | $ 56,000 |  |  |  |  |  |  |  |
Payment of debt and liquidity to fund operations and current debt obligations |  |  | $ 40,000 |  |  |  |  |  |  |  |
Subsequent Event | UST Loan [Member] | CRJ-900 Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | AirCraft |  |  |  | 4 |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  |  | $ 12,000 |  |  |  |  |  |  |
Proceeds from sale of asset |  |  |  | $ 6,500 |  |  |  |  |  |  |
Subsequent Event | UST Loan [Member] | CRJ-900 Aircraft [Member] | Aircraft Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | AirCraft |  |  |  | 4 |  |  |  |  |  |  |
Gross proceeds from sale of asset |  |  |  | $ 12,000 |  |  |  |  |  |  |
Proceeds from sale of asset |  |  |  | $ 6,500 |  |  |  |  |  |  |
Forecast [Member] | CRJ-900 Aircraft [Member] | EDC Loan and MHIRJ Junior Note [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan forgiven |  | $ 5,000 |  |  |  |  |  |  |  |  |
Repayments of long term debt |  | $ 4,200 |  |  |  |  |  |  |  |  |
Forecast [Member] | Impact Of Pilot Shortage and Attrition [Member] | RASPRO Aircraft Lease Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Buyout price |  |  |  |  |  |  | $ 50,300 |  |  |  |
Net cash from aircraft and equipment purchase agreement |  |  |  |  |  |  | $ (12,100) |  |  |  |
Forecast [Member] | Impact Of Pilot Shortage and Attrition [Member] | RASPRO Aircraft Lease Agreement One [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of engines | AirCraft |  |  |  |  |  |  | 30 |  |  |  |
Buyout pricing |  |  |  |  |  |  | $ 19,500 |  |  |  |
Forecast [Member] | Impact Of Pilot Shortage and Attrition [Member] | RASPRO Aircraft Lease Agreement Two [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Buyout pricing |  |  |  |  |  |  | $ 18,800 |  |  |  |
Number of airframes without engines | AirCraft |  |  |  |  |  |  | 15 |  |  |  |
Forecast [Member] | Impact Of Pilot Shortage and Attrition [Member] | Airframe and Engine Purchase Commitments [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net cash from aircraft and equipment purchase agreement |  |  |  |  |  |  | $ (12,100) |  |  |  |
Forecast [Member] | Impact Of Pilot Shortage and Attrition [Member] | Airframe and Engine Purchase Commitments [Member] | RASPRO Aircraft Lease Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Buyout price |  |  |  |  |  |  | $ 50,300 |  |  |  |
Forecast [Member] | Impact Of Pilot Shortage and Attrition [Member] | Airframe and Engine Purchase Commitments [Member] | RASPRO Aircraft Lease Agreement One [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of engines | Engine |  |  |  |  |  |  | 30 |  |  |  |
Buyout pricing |  |  |  |  |  |  | $ 19,500 |  |  |  |
Forecast [Member] | Impact Of Pilot Shortage and Attrition [Member] | Airframe and Engine Purchase Commitments [Member] | RASPRO Aircraft Lease Agreement Two [Member] |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Buyout pricing |  |  |  |  |  |  | $ 18,800 |  |  |  |
Number of airframes without engines | AirCraft |  |  |  |  |  |  | 15 |  |  |  |

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Name: | us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=mesa_AirframeAndEnginePurchaseCommitmentsMember
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Data Type: | na
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