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Long-Term Debt, Finance Leases, and Other Borrowings - Schedule of Long-term Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Sep. 30, 2024
Debt Instrument [Line Items]    
Gross long-term debt, including current maturities $ 230,608 $ 315,210
Less unamortized debt issuance costs (1,433) (2,395)
Less notes payable warrants (2,114) (2,544)
Net long-term debt, including current maturities 227,061 310,271
Less current portion, net of unamortized debt issuance costs (143,275) (50,455)
Net long-term debt 83,786 259,816
Revolving credit facility quaterly collateralized by underlying equipment and investments through two thousand twenty eight [Member]    
Debt Instrument [Line Items]    
Gross long-term debt, including current maturities 33,018 37,520
Notes Payable to Secured Parties, Due in Semi Annual Installments Collateralized by the Underlying Aircraft Through 2028 [Member]    
Debt Instrument [Line Items]    
Gross long-term debt, including current maturities 85,469 85,469
Notes Payable to Secured Parties, Due in Quarterly Installments Collateralized by the Underlying Aircraft Through 2028 [Member]    
Debt Instrument [Line Items]    
Gross long-term debt, including current maturities 0 73,884
Other Obligations Due to Financial Institutions, Monthly or Quarterly Collateralized by the Underlying Equipment, Due 2022 Through 2031 [Member]    
Debt Instrument [Line Items]    
Gross long-term debt, including current maturities 0 4,681
Notes Payable to UST, Quarterly, Through 2025 [Member]    
Debt Instrument [Line Items]    
Gross long-term debt, including current maturities $ 112,121 $ 113,656