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Long-Term Debt, Finance Leases, and Other Borrowings - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Oct. 24, 2025
Mar. 01, 2025
Nov. 23, 2024
Sep. 23, 2024
Jan. 11, 2024
USD ($)
Sep. 06, 2023
USD ($)
Dec. 27, 2022
USD ($)
Oct. 30, 2020
USD ($)
$ / shares
shares
Feb. 28, 2025
Dec. 31, 2024
USD ($)
$ / shares
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Nov. 14, 2020
USD ($)
Nov. 13, 2020
USD ($)
Debt Instrument [Line Items]                            
Property and equipment, net                   $ 203,567,000 $ 426,351,000 $ 698,022,000    
Long-Term Debt                   227,061,000 310,271,000 528,278,000    
Debt outstanding                   $ 230,608,000 315,210,000 $ 538,274,000    
Warrants of common stock exercise price | $ / shares                   $ 3.98        
Treasury Loan [Member]                            
Debt Instrument [Line Items]                            
Debt outstanding                   $ 112,100,000        
Minimum collateral coverage ratio covenant     1.55 1.44                    
Principal payments                   1,500,000        
Treasury Loan [Member] | Subsequent Event [Member]                            
Debt Instrument [Line Items]                            
Minimum collateral coverage ratio covenant   1.55             0.99          
Treasury Loan [Member] | Maximum [Member]                            
Debt Instrument [Line Items]                            
Calculated collateral coverage ratio               1.55            
Treasury Loan [Member] | Minimum [Member]                            
Debt Instrument [Line Items]                            
Additional collateral coverage ratio               1.55            
Loan Agreement [Member]                            
Debt Instrument [Line Items]                            
Secured term loan facility, amount borrowed               $ 43,000,000            
Secured term loan facility, additional amount borrowed                           $ 152,000,000
Warrants to purchase shares of common stock | shares               4,899,497            
Warrants of common stock exercise price | $ / shares               $ 3.98            
Debt issuance costs allocated to warrants                   100,000        
Loan Agreement [Member] | EDC Loans [Member]                            
Debt Instrument [Line Items]                            
Debt issuance costs                           3,100,000
Loan Agreement [Member] | FortyThreeMillionTreasuryLoanMember                            
Debt Instrument [Line Items]                            
Capitalized debt issuance costs, net               $ 700,000            
Loan Agreement [Member] | $152M Treasury Loan [Member]                            
Debt Instrument [Line Items]                            
Capitalized debt issuance costs, net                           2,300,000
Revolving Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Repayments of long term debt         $ 2,100,000                  
Permitted amount to redraw from existing credit facility           $ 7,900,000                
Revolving Credit Facility [Member] | Maximum [Member]                            
Debt Instrument [Line Items]                            
Revolving commitments           50,700,000                
Revolving Credit Facility [Member] | Minimum [Member]                            
Debt Instrument [Line Items]                            
Revolving commitments           $ 30,700,000                
Equipment Notes [Member]                            
Debt Instrument [Line Items]                            
Long-Term Debt                   $ 85,500,000        
Secured Term Loan Facility [Member] | Loan Agreement [Member]                            
Debt Instrument [Line Items]                            
Secured term loan facility, maximum borrowing capacity               200,000,000            
Debt instrument, maturity date                   Oct. 30, 2025        
Secured Term Loan Facility [Member] | Loan Agreement [Member] | Subsequent Event [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, maturity date Nov. 28, 2025                          
Secured Term Loan Facility [Member] | Loan Agreement [Member] | Treasury Loan [Member]                            
Debt Instrument [Line Items]                            
Secured term loan facility, amount borrowed               $ 43,000,000            
Secured term loan facility, additional amount borrowed                         $ 0 $ 152,000,000
Debt instrument, maturity date               Oct. 30, 2025            
Long term debt, basis spread on variable rate               3.50%            
United Capacity Purchase Agreement [Member]                            
Debt Instrument [Line Items]                            
Repayments of long term debt         $ 10,500,000                  
United Capacity Purchase Agreement [Member] | United [Member]                            
Debt Instrument [Line Items]                            
Percentage of controllable completion factor                   99.30%        
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Repayments of lines of credit                     10,500,000      
Long term debt, basis spread on variable rate           3.50% 3.50%              
Revolving loan             $ 10,500,000              
Revolving commitments             30,700,000              
Covenant capping restricted payments             $ 5,000,000              
Rental coverage ratio             1              
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member] | SOFR [Member]                            
Debt Instrument [Line Items]                            
Long term debt, basis spread on variable rate           4.50% 4.50%              
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member] | United [Member]                            
Debt Instrument [Line Items]                            
Amount funded by company                   $ 25,500,000        
Additional prepayment with potential forgiveness                   15,000,000 $ 15,000,000      
Deemed prepayment, outstanding                   4,500,000        
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member]                            
Debt Instrument [Line Items]                            
Amount required             $ 15,000,000              
Aircraft and Equipment [Member] | Pledged as Collateral [Member]                            
Debt Instrument [Line Items]                            
Property and equipment, net                   $ 217,400,000