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Document and Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 27, 2023
Mar. 31, 2023
Cover [Abstract]        
Document Type 10-K/A      
Amendment Flag true      
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, 2023, originally filed with the Securities and Exchange Commission (the “SEC”) on January 26, 2024 (the “Original Filing”), as follows:•Items 10, 11, 12, 13 and 14. To includes Items 10, 11, 12, 13 and 14 of Part III of Form 10-K. We previously omitted this information from our 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 our Original Filing. This Amendment amends and restates in their entirety Items 10, 11, 12, 13 and 14 of Part III of our Original Filing. The cover page of our Original Filing is also amended to delete the reference to the incorporation by reference to our definitive proxy statement.      
Document Period End Date Sep. 30, 2023      
Document Fiscal Year Focus 2023      
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 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 true      
Entity Public Float       $ 96,267,679
Entity Common Stock, Shares Outstanding     40,940,326  
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] true      
Document Financial Statement Restatement Recovery Analysis [Flag] false      
Security Exchange Name NASDAQ      
Auditor Name RSM US LLP Ernst & Young LLP    
Auditor Firm ID 49 42    
Auditor Location Phoenix Arizona Phoenix, Arizona    
Documents Incorporated by Reference

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