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Document and Entity Information - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Nov. 14, 2025
Mar. 31, 2025
Cover [Abstract]            
Document Type 10-KT          
Amendment Flag false          
Document Period Start Date Oct. 01, 2024          
Document Period End Date Dec. 31, 2024          
Document Fiscal Year Focus 2024          
Document Fiscal Period Focus FY          
Trading Symbol MESA          
Entity Registrant Name MESA AIR GROUP, INC.          
Entity Central Index Key 0000810332          
Current Fiscal Year End Date --12-31          
Entity Filer Category Non-accelerated Filer          
Entity Well-known Seasoned Issuer No          
Entity Current Reporting Status Yes          
Entity Voluntary Filers No          
Entity Interactive Data Current Yes          
Entity Shell Company false          
Entity Small Business false          
Entity Emerging Growth Company false          
ICFR Auditor Attestation Flag false          
Entity Public Float           $ 32,364,861
Entity Common Stock, Shares Outstanding         41,886,643  
Entity File Number 001-38626          
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, City or Town PHOENIX          
Entity Address, State or Province AZ          
Entity Address, Postal Zip Code 85008          
City Area Code 602          
Local Phone Number 685-4000          
Document Annual Report false          
Document Transition Report true          
Title of 12(b) Security Common Stock, no par value          
Document Financial Statement Error Correction [Flag] false          
Security Exchange Name NASDAQ          
Auditor Name CBIZ CPAs P.C. Marcum llp RSM US LLP Ernst & Young LLP    
Auditor Firm ID 199 688 49 42    
Auditor Location Melville, NY Melville, NY Phoenix, Arizona Phoenix, Arizona    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Registrant's definitive proxy statement relating to its 2025 annual meeting of shareholders are incorporated by reference into Part III of this Transition Report where indicated. The Registrant’s definitive proxy statement for its 2025 annual meeting of shareholders was filed with the Securities and Exchange Commission on July 11, 2025.

          
Auditor Opinion [Text Block]

Opinion on the Financial Statements

We have audited the accompanying consolidated statements of operations and comprehensive loss, stockholders’ equity and cash flows for the year ended September 30, 2022, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the results of the Company's operations and its cash flows for the year ended September 30, 2022, in conformity with U.S. generally accepted accounting principles.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheet of Mesa Air Group, Inc. (the Company) as of September 30, 2023, the related consolidated statements of operations and comprehensive (loss) income, stockholders’ equity and cash flows, for the year then ended and the related notes (collectively, the financial statements). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of September 30, 2023, and the results of its operations and its cash flows for the year then ended in conformity with accounting principles generally accepted in the United States of America.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheet of Mesa Air Group, Inc. (the “Company”) as of September 30, 2024, the related consolidated statements of operations and comprehensive loss, stockholders’ equity and cash flows for the year ended September 30, 2024, and the related notes (collectively referred to as the “financial statements”). In our opinion, based on our audit, the financial statements present fairly, in all material respects, the financial position of the Company as of September 30, 2024, and the results of its operations and its cash flows the year ended September 30, 2024, in conformity with accounting principles generally accepted in the United States of America.