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Organization and Operations - Additional Information (Detail)
 1 Months Ended 3 Months Ended 6 Months Ended 24 Months Ended
Sep. 30, 2023
USD ($)
AirCraft
Apr. 01, 2023
USD ($)
Engine
Jan. 13, 2023
$ / shares
shares
Dec. 20, 2019
AirCraft
Apr. 30, 2023
Engine
Mar. 31, 2023
USD ($)
DailyDeparture
State
AirCraft
Engine
$ / shares
shares
Jun. 30, 2023
AirCraft
Mar. 31, 2023
USD ($)
DailyDeparture
State
AirCraft
$ / shares
shares
Dec. 31, 2022
USD ($)
AirCraft
Sep. 30, 2022
$ / shares
shares
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2023
USD ($)
DailyDeparture
AirCraft
Employee
Flighthour
City
Engine
State
$ / shares
shares
Mar. 31, 2022
USD ($)
Dec. 31, 2024
USD ($)
AirCraft
Apr. 03, 2023
USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of states in which entity operates | State           42   42         42      
Number of aircrafts operated | AirCraft                         109      
Number of cities in which entity operates | City                         105      
Number of daily departures | DailyDeparture           325   325         325      
Number of employees | Employee                         2,388      
Net cash provided by operating activities                         $ (8,636,000) $ 9,958,000    
Net loss               $ (35,122,000) $ (9,090,000)   $ (42,783,000) $ (14,274,000) (44,211,000) $ (57,057,000)    
Proceeds from sale of property                         $ 28,600,000      
Number of spare engines to be sold | Engine                         30      
Number of spare engines sold | Engine           10                    
Gross proceeds from sale of asset                         $ 88,000,000      
Retirement of debt from sale of productive assets           $ 5,600,000   5,600,000         5,600,000      
Proceeds from sale of asset                         34,400,000      
Revolving loan           25,500,000   25,500,000         25,500,000      
Additional prepayment with potential forgiveness                         15,000,000      
Reduction in loan amount                 $ 5,000,000              
Upfront provided for flight time out-of-pocket expense                         0      
Short-term debt           $ 145,000,000.0   $ 145,000,000.0         $ 145,000,000.0      
Consideration For Amended Description                         Also in January 2023, consideration for entering in the Amended and Restated United CPA and providing the revolving line of credit, discussed in Note 9, the Company (i) agreed to grant United the right to designate one (1) individual (the "United Designee") and (ii) issued to United 4,042,061 shares of the Company’s common stock, no par value per share, equal to approximately 10% of the Company’s issued and outstanding capital stock on such date (the "United Shares"). United's board designee rights will terminate at such time as United's equity ownership in the Company falls below five percent (5%).      
United capacity purchase agreement termination notice period                         30 days      
Amended and restated bylaws descriptions                         Pursuant to Section 3.15 of the Bylaws of the Company, United has the right to designate one person to be a member of both the Company's Board and the Board of Directors of Mesa Airlines, subject to the reasonable approval of the Board.      
Common stock, no par value | $ / shares           $ 0   $ 0   $ 0     $ 0      
Common stock, shares issued | shares           40,619,274   40,619,274   36,376,897     40,619,274      
Subsequent Event [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of spare engines sold | Engine         6                      
Gross proceeds from sale of asset   $ 11,000,000                            
Number of engine sold | Engine   6                            
Retirement of debt from sale of productive assets                               $ 11,000,000
RASPRO Aircraft Lease Agreement [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of aircraft lease terminated | AirCraft                 15              
Buyout pricing                 $ 25,000,000              
Impact of Pilot Shortage and Attrition [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Net cash provided by operating activities                         $ 8,600,000      
Net loss                         44,200,000      
Non-cash impairment charge                         $ 20,500,000      
Captains [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Increased overall hourly pay due to pilot shortage and attrition                   118.00%            
New Hire First Officers [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Increased overall hourly pay due to pilot shortage and attrition                   172.00%            
United Capacity Purchase Agreement [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Amended and restated bylaws descriptions                         On January 13, 2023, the Company’s Board of Directors approved a resolution to amend the Company’s Amended and Restated Bylaws (the “Bylaws”) in connection with the Company’s entry into the Amended and Restated United CPA, see Note 1, which provides United with the right to designate one (1) representative to be a member of the Board, provided that United holds at least five percent (5%) of the issued and outstanding shares of capital stock of the Company, and provided that such United Designee shall be subject to the reasonable approval of the Board. Until the earlier of January 1, 2026, or the Company’s entry into a definitive binding agreement for the performance of regional airline services with a major air carrier other than United, the Board shall not take, or make any recommendation to the stockholders of the Company      
United Capacity Purchase Agreement [Member] | United [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Common stock, no par value | $ / shares     $ 0                          
Common stock issued equivalent percentage of issued and outstanding capital stock     10.00%                          
Common stock, shares issued | shares     4,042,061                          
Mesa Pilot Development Program [Member] | Maximum [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Flight hours required to fly commercial aircraft | Flighthour                         1,500      
CRJ-700 Aircraft [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Proceeds from sale of property                         $ 8,000,000      
Number of aircraft sold | AirCraft               8                
CRJ-700 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of aircrafts listed for sale | AirCraft                         18      
Number of aircraft sold | AirCraft                         18      
Aircraft lease term                         9 years      
Number of aircraft leased | AirCraft                         10      
CRJ-900 Aircraft [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of aircrafts listed for sale | AirCraft                         11      
Number of surplus aircraft to be sold | AirCraft                         7      
Proceeds from sale of property                         $ 8,200,000      
Number of aircraft sold | AirCraft               4         11      
Number of aircraft classified as assets held for sale | AirCraft                         7      
Gross proceeds from sale of asset                         $ 33,000,000      
Expected gross proceeds from sale of asset                         72,000,000      
Retirement of debt from sale of productive assets           $ 69,000,000   $ 69,000,000         $ 69,000,000      
CRJ-900 Aircraft [Member] | Scenario Forecast [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of aircraft sold | AirCraft 7                              
Gross proceeds from sale of asset $ 21,000,000                              
CRJ-900 Aircraft [Member] | Export Development Bank of Canada Agreement [Member] | Scenario Forecast [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of aircrafts operated | AirCraft                             7  
Maximum liquidity provided                             $ 14,000,000  
CRJ-900 Aircraft [Member] | RASPRO Aircraft Lease Agreement [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of aircraft to be sold | AirCraft             7                  
Number of aircraft lease terminated | AirCraft                         15      
Buyout pricing                         $ 25,000,000      
Buyout price                         $ 52,000,000      
CRJ-900 Aircraft [Member] | American Capacity Purchase Agreement [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of aircrafts operated | AirCraft               40                
CRJ-900 Aircraft [Member] | United Capacity Purchase Agreement [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of aircrafts operated | AirCraft           10             10      
Maximum number of aircraft to be operated | AirCraft                         38      
CRJ-200 Aircraft [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of aircrafts listed for sale | AirCraft                         1      
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of aircrafts operated | AirCraft                         60      
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of aircrafts operated | AirCraft                         42      
Number of aircrafts owned | AirCraft                         18      
Lease expiration year                         2028      
Notice period for termination of agreement                         United, subject to certain conditions, including the payment of certain costs tied to aircraft type, may terminate the agreement in its discretion, or remove E-175 aircraft from service, by giving us notice of 90 days or more      
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member] | Minimum [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Lease expiration year                         2024      
E-175 Aircraft [Member] | United Capacity Purchase Agreement [Member] | United [Member] | Maximum [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Lease expiration year                         2028      
E175LL Aircraft [Member] | United Capacity Purchase Agreement [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of aircrafts operated | AirCraft                         3      
Air crafts expiring month and year description                         in 2032 and 2033      
Boeing 737400F [Member] | DHL Flight Services Agreement [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of aircrafts operated | AirCraft       4                        
Aircraft lease term       5 years                        
Number of aircraft leased | AirCraft       2                        
Notice period for termination of agreement                         At any time after the first anniversary of the commencement date of the first aircraft placed in service with 90 days' written notice.      
Aircraft option to extend agreement description                         DHL has the option to extend the agreement with respect to one (1) or more aircraft for a period of one (1) year with 90 days’ advance written notice.      
Boeing 737-800F [Member] | DHL Flight Services Agreement [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of aircraft leased | AirCraft       1                        
Pipistrel Alpha Trainer 2 Aircraft [Member] | Mesa Pilot Development Program [Member]                                
Organization Consolidation And Presentation Of Financial Statements [Line Items]                                
Number of aircrafts purchased | AirCraft                         29      
Flight costs per hour                         $ 25