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Organization and Operations - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 15, 2020
Air-craft
Apr. 03, 2020
Air-craft
Jan. 02, 2020
Air-craft
Nov. 26, 2019
Air-craft
Nov. 25, 2019
Air-craft
Jan. 31, 2019
Air-craft
Apr. 30, 2020
USD ($)
Installment
Jul. 31, 2019
Air-craft
Jun. 30, 2020
USD ($)
Daily_Departure
State
Jun. 30, 2020
USD ($)
Daily_Departure
State
Air-craft
City
Employee
Jun. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Apr. 02, 2019
Air-craft
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of states in which entity operates | State                 29 29      
Number of aircrafts operated                   145      
Number of cities in which entity operates | City                   66      
Number of daily departures | Daily_Departure                 175 175      
Number of employees | Employee                   3,400      
Cash and cash equivalents | $                 $ 64,934 $ 64,934   $ 68,855  
Reducing planned heavy engine and airframe maintenance events | $                   16,800      
Drew amount from undrawn revolving credit facility | $                   $ 23,000 $ 163,658    
CARES act grant amount | $             $ 92,500            
CARES act, grants received | $             46,300            
CARES act, remaining grants yet to receive | $             $ 46,200            
Number of installments to receive remaining grants | Installment             3            
CARES act, utilized offset payroll expenses | $                 43,000        
CARES act, deferred offset future payroll cost | $                 $ 3,300        
CARES Act of 2020 loan amount allocated under loan program | $             $ 277,000            
Maximum number of aircraft to permanently withdraw in the event company fails to meet new/ revise performance metrics           6              
Number of aircraft converted to be utilized as operational spares                         2
Number of aircraft permanently withdraw due to failure to meet new/revised performance metrics 2             2          
American capacity purchase agreement termination notice period                   15 days      
Number of additional aircraft permanently withdrawn due to company's failure to meet certain performance metrics         2                
Number of deferred aircraft elected to remove     1                    
Maximum number of aircraft to withdraw in the event company fails to meet new/ revise performance metrics                   14      
Number of aircraft removed due to failure to meet new/revised performance metrics     3                    
Number of aircraft that would be withdrawn at any time due to failure to meet new/revised performance metrics   3                      
Notice period for termination of agreement                   Our United Capacity Purchase Agreement permits United, subject to certain conditions, including the payment of certain costs tied to aircraft type, to terminate the agreement in its discretion, or remove aircraft from service, by giving us notice of 90 days or more.      
United capacity purchase agreement termination notice period                   30 days      
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      
CRJ-900 Aircraft [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated                   54      
CRJ-900 Aircraft [Member] | Aircraft Lease Expire In 2021 [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of operated aircrafts expired or set to expire                   31      
Lease expiration year                   2021      
CRJ-900 Aircraft [Member] | Aircraft Lease Expire In 2021 [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of operated aircrafts expired or set to expire                   16      
Lease expiration year                   2022      
CRJ-900 Aircraft [Member] | Aircraft Lease Expire In 2025 [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of operated aircrafts expired or set to expire                   7      
Lease expiration year                   2025      
CRJ-700 Aircraft [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated                   20      
CRJ-700 Aircraft [Member] | United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Aircraft lease term       7 years                  
E-175 Aircraft [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated       18           60      
Lease expiration year       2028                  
E-175 Aircraft [Member] | Mesa [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated                   18      
E-175 Aircraft [Member] | United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of aircrafts operated       42           42      
Aircraft lease extension period       5 years                  
E-175 Aircraft [Member] | Minimum [Member] | United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Lease expiration year       2024                  
E-175 Aircraft [Member] | Maximum [Member] | United [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Lease expiration year       2028                  
E175LL Aircraft [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Number of additional aircrafts       20                  
Number of years in operation       12 years                  
Air drafts delivery month and year description.                   Deliveries of the new E175LL aircraft were scheduled to begin in May 2020 and be completed by December 31, 2020.      
Termination of aircraft operation, description                   Commencing five (5) years after the actual in-service date, United has the right to remove the E175LL aircraft from service by giving us notice of 90 days or more, subject to certain conditions, including the payment of certain wind-down expenses plus, if removed prior to the ten (10) year anniversary of the in-service date, certain accelerated margin payments.      
Revolving Credit Facility [Member]                          
Organization Consolidation And Presentation Of Financial Statements [Line Items]                          
Drew amount from undrawn revolving credit facility | $                   $ 23,000