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Document and Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Mar. 31, 2022
Cover [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Period End Date Sep. 30, 2022  
Document Fiscal Year Focus 2022  
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 true  
Entity Ex Transition Period true  
ICFR Auditor Attestation Flag false  
Entity Public Float   $ 158,957,586
Entity Common Stock, Shares Outstanding 36,376,897  
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  
Security Exchange Name NASDAQ  
Auditor Name Ernst & Young LLP  
Auditor Firm ID 42  
Auditor Location Phoenix, Arizona  
Documents Incorporated by Reference Portions of the Registrant's definitive proxy statement relating to its 2023 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 2023 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