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Organization and Operations - Additional Information (Detail)
$ / shares in Units, $ in Millions
 6 Months Ended 12 Months Ended
Mar. 31, 2019
Daily_Departure
State
Air-craft
shares
Sep. 11, 2018
$ / shares
shares
Aug. 14, 2018
USD ($)
$ / shares
shares
Aug. 08, 2018
shares
Mar. 31, 2019
USD ($)
Daily_Departure
State
Air-craft
City
Employee
Extension
shares
Sep. 30, 2018
Air-craft
Extension
shares
Apr. 02, 2019
Air-craft
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of states in which entity operates | State 41       41    
Number of aircrafts operated | Air-craft         145    
Number of cities in which entity operates | City         129    
Number of daily departures | Daily_Departure 609       609    
Number of employees | Employee         3,400    
Common stock, stock split         Effected a 2.5-for-1 stock split    
Stock split ratio       2.5      
Common stock, shares authorized 125,000,000     125,000,000 125,000,000 125,000,000  
Preferred stock, shares authorized 5,000,000     5,000,000 5,000,000 5,000,000  
Stock issued during period, shares, new issues   1,344,500          
Common stock, warrants issued 6,780,297       6,780,297 10,614,990  
Maximum number of aircraft to permanently withdraw in the event company fails to meet new/ revise performance metrics | Air-craft 6            
Number of aircraft converted to be utilized as operational spares | Air-craft             2
Notice period for termination of agreement         The capacity purchase agreement is also subject to early termination for cause under specified circumstances and subject to the Company's right to cure under certain circumstances. United is also permitted, subject to certain conditions, to terminate the agreement early in its discretion by giving Mesa notice of 90 days or more    
Payment of lease cost | $         $ 1.9    
United [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of extension | Extension         4 4  
Renewal term extension period         2 years 2 years  
Minimum [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Capacity purchase agreement, expiration year         2021    
Maximum [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Capacity purchase agreement, expiration year         2025    
Maximum [Member] | United [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Aggregate extension period         8 years 8 years  
CRJ-900 Aircraft [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of aircrafts operated | Air-craft         64    
CRJ-700 Aircraft [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of aircrafts operated | Air-craft         20    
CRJ-700 Aircraft [Member] | Minimum [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Early termination right, expiration period         2019-08    
CRJ-700 Aircraft [Member] | Maximum [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Early termination right, expiration period         2019-12    
E-175 Aircraft [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of aircrafts operated | Air-craft         60    
E-175 Aircraft [Member] | Mesa [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of aircrafts operated | Air-craft         18    
E-175 Aircraft [Member] | United [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of aircrafts operated | Air-craft         30 12  
E-175 Aircraft [Member] | Minimum [Member] | Mesa [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Early termination right, expiration period         2028-01    
E-175 Aircraft [Member] | Minimum [Member] | United [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Early termination right, expiration period         2019-06    
E-175 Aircraft [Member] | Maximum [Member] | Mesa [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Early termination right, expiration period         2028-11    
E-175 Aircraft [Member] | Maximum [Member] | United [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Early termination right, expiration period         2020-08    
American Airlines Inc. [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Ownership interest 7.20%       7.20% 7.20%  
Restricted Stock [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of Shares, Granted         49,000    
2018 Equity Incentive Plan [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Stock withheld to cover tax withholding requirements upon vesting to restricted stock units shares     314,198        
Restricted stock, shares issued net of shares for tax withholdings     651,824        
2018 Equity Incentive Plan [Member] | Restricted Stock [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of Shares, Granted     1,266,034        
Number of Shares, vested     966,022        
2018 Equity Incentive Plan [Member] | Restricted Stock [Member] | Employees [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Additional restricted common stock shares issued     983,113        
2011 and 2017 Plans [Member] | Restricted Stock [Member] | Employees [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Cancellation of common stock shares existing unvested restricted phantom units     491,915        
Cancellation of common stock shares existing of unvested restricted stock     491,198        
IPO [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Stock issued during period, shares, new issues     9,630,000        
Shares issued, price per share | $ / shares     $ 12.00        
Gross proceeds of initial public offering | $     $ 115.6   $ 124.2    
Net proceeds from initial public offering | $         111.7    
Underwriting discounts and commissions | $         8.7    
Offering costs | $         $ 3.8    
Underwriter Options [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Common stock, warrants issued     1,444,500        
Purchased Directly From Company [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Stock issued during period, shares, new issues   723,985          
Purchased Directly From Selling Shareholders [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Stock issued during period, shares, new issues   620,515          
Firm Shares and Option Shares [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Shares issued, price per share | $ / shares   $ 12.00