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Document and Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 05, 2024
Mar. 31, 2024
Cover [Abstract]        
Document Type 10-K      
Amendment Flag false      
Document Period End Date Sep. 30, 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 --09-30      
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       $ 36,231,551
Entity Common Stock, Shares Outstanding     41,331,719  
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 true      
Document Transition Report false      
Title of 12(b) Security Common Stock, no par value      
Document Financial Statement Error Correction [Flag] false      
Security Exchange Name NASDAQ      
Auditor Name Marcum llp RSM US LLP    
Auditor Firm ID 199 49    
Auditor Location Melville, NY 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 Annual Report on Form 10-K where indicated. The Registrant’s definitive proxy statement for its 2025 annual meeting of shareholders will be filed with the Securities and Exchange Commission within 120 days after the end of the Registrant’s fiscal year to which this report relates.

      
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.