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Long-Term Debt, Finance Leases, and Other Borrowings - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 18, 2025
Dec. 23, 2024
Jul. 01, 2024
USD ($)
Sep. 06, 2023
USD ($)
Dec. 27, 2022
USD ($)
Oct. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Jun. 30, 2025
USD ($)
$ / shares
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]                              
Property and equipment-gross                     $ 59,692,000     $ 600,924,000  
Long-Term Debt                     112,970,000     310,271,000  
Current portion of long-term debt                     $ 84,725,000     $ 50,455,000  
Gain on investments                 $ (776,000)     $ 6,454,000      
Warrants of common stock exercise price | $ / shares                     $ 3.98        
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]                              
Warrants to purchase shares of common stock | shares           4,899,497                  
Warrants of common stock exercise price | $ / shares           $ 3.98                  
Revolving Credit Facility [Member]                              
Debt Instrument [Line Items]                              
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                      
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member]                              
Debt Instrument [Line Items]                              
Long term debt, basis spread on variable rate       3.50% 3.50%                    
Revolving loan         $ 10,500,000                    
Covenant capping restricted payments         5,000,000                    
Repayments of lines of credit                   $ 10,500,000          
Revolving commitments         $ 30,700,000                    
Rental coverage ratio         1                    
United Capacity Purchase Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member]                              
Debt Instrument [Line Items]                              
Amount required                         $ 15,000,000    
Fee waiver granted on minimum liquidity requirement     $ 15,000,000                        
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] | United [Member]                              
Debt Instrument [Line Items]                              
Percentage of controllable completion factor                     99.30%        
United Capacity Purchase Agreement [Member] | United [Member] | Revolving Credit Facility [Member]                              
Debt Instrument [Line Items]                              
Deemed prepayment, outstanding                     $ 4,500,000        
Amount funded by company                         $ 25,500,000    
Additional prepayment with potential forgiveness               $ 15,000,000     $ 15,000,000        
Secured Term Loan Facility [Member] | Loan Agreement [Member]                              
Debt Instrument [Line Items]                              
Secured term loan facility, maximum borrowing capacity           $ 200,000,000.0                  
Debt instrument, maturity date                     Oct. 30, 2025        
Secured Term Loan Facility [Member] | Loan Agreement [Member] | Treasury Loan [Member]                              
Debt Instrument [Line Items]                              
Long term debt, basis spread on variable rate           3.50%                  
Percentage of all in rate                     8.06%        
Secured term loan facility, amount borrowed                             $ 195,000,000.0
Secured term loan facility, additional amount borrowed                     $ 0        
Debt instrument, maturity date           Oct. 30, 2025                  
UST Loan [Member] | Minimum [Member]                              
Debt Instrument [Line Items]                              
Minimum Collateral Coverage Ratio 1 91 99                          
E175 Aircraft [Member]                              
Debt Instrument [Line Items]                              
Remaining Balance             $ 73,400,000                
Aircraft and Equipment [Member] | Pledged as Collateral [Member]                              
Debt Instrument [Line Items]                              
Property and equipment-gross                     $ 46,700,000