XML 14 R1.htm IDEA: XBRL DOCUMENT v3.23.4
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      
Amendment Flag false      
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

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Registrant's definitive proxy statement relating to its 2024 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 2024 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.