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Cover - USD ($)
 12 Months Ended
Sep. 30, 2024
Jun. 20, 2025
Mar. 31, 2024
Document Information [Line Items]      
Document Type 10-K/A    
Document Annual Report true    
Current Fiscal Year End Date --09-30    
Document Period End Date Sep. 30, 2024    
Document Transition Report false    
Entity File Number 001-38626    
Entity Registrant Name MESA AIR GROUP, INC.    
Entity Incorporation, State or Country Code NV    
Entity Tax Identification Number 85-0302351    
Entity Address, Address Line One 410 NORTH 44TH STREET    
Entity Address, Address Line Two SUITE 700    
Entity Address, State or Province AZ    
Entity Address, City or Town PHOENIX    
Entity Address, Postal Zip Code 85008    
City Area Code 602    
Local Phone Number 685-4000    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 36,231,551
Entity Common Stock, Shares Outstanding   41,861,544  
Entity Central Index Key 0000810332    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag true    
Title of 12(b) Security Common Stock, no par value    
Trading Symbol MESA    
Security Exchange Name NASDAQ    
Amendment Description Mesa Air Group, Inc. (“Mesa,” the “Company,” “we,” “us,” or “our”) is filing this Amendment No. 1 on Form 10-K/A (this “Amendment”) to amend our Annual Report on Form 10-K for the fiscal year ended September 30, 2024, originally filed with the Securities and Exchange Commission (the “SEC”) on May 14, 2025 (the “Original Filing”), as follows:     •   to include Items 10, 11, 12, 13 and 14 of Part III of Form 10-K. We previously omitted this information from the Original Filing in reliance on General Instruction G(3) to Form 10-K, which permits the above-referenced items to be incorporated in our Form 10-K by reference to our definitive proxy statement if such statement is filed no later than 120 days after our fiscal year-end. We are filing this Amendment to provide the information required in Part III of Form 10-K because we will not file a definitive proxy statement containing that information within 120 days after the end of the fiscal year covered by the Original Filing;     •   to include additional exhibits in Item 15 of Part IV of the Original Filing required by Item 601 of Regulation S-K, and to ensure that all material agreements and other documents entered into and disclosed after the end of the fiscal year on Form 8-K, but prior to the filing of this Amendment, are incorporated into our Annual Report; and     •   to file new certifications of our principal executive officer and principal financial officer as exhibits to this Amendment under Item 15 of Part IV hereof, pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, as amended (“Exchange Act”). Because no financial statements are contained within this Amendment, we are not including certifications pursuant to Section 906 of The Sarbanes-Oxley Act of 2002. This Amendment amends and restates in their entirety Items 10, 11, 12, 13, 14 and 15 of Part III of the Original Filing. The cover page of the Original Filing is also amended to delete the reference to the incorporation by reference to our definitive proxy statement. This Amendment does not otherwise change or update any of the disclosures set forth in the Original Filing and does not otherwise reflect any events occurring after the filing of the Original Filing. Accordingly, this Amendment should be read in conjunction with the Original Filings and the Company’s filings made with the SEC subsequent to the filing of the Original Filing. Capitalized terms used herein and not otherwise defined are set forth in the Original Filing.    
Documents Incorporated by Reference [Text Block]
DOCUMENTS INCORPORATED BY REFERENCE
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