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Long-Term Debt, Finance Leases, and Other Borrowings - Schedule of Long-term Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Sep. 30, 2023
Debt Instrument [Line Items]    
Gross long-term debt, including current maturities $ 366,354 $ 538,274
Less unamortized debt issuance costs (2,693) (5,083)
Less notes payable warrants (3,143) (4,913)
Net long-term debt, including current maturities 360,518 528,278
Less current portion, net of unamortized debt issuance costs (72,769) (163,550)
Net long-term debt 287,749 364,728
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 38,020 40,630
Senior and Subordinated Notes Payable to Secured Parties, Due in Monthly Installments Collateralized by the Underlying Aircraft Through 2027 [Member]    
Debt Instrument [Line Items]    
Gross long-term debt, including current maturities   39,018
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 97,287 108,815
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 78,201 90,401
United Bridge Loan Quaterly Collateralized By Underlying Equipment And Investments Through Two Thousand Twenty Four [Member]    
Debt Instrument [Line Items]    
Gross long-term debt, including current maturities   10,500
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 30,691 67,637
Notes Payable to Financial Institution, Due in Monthly Installments Collateralized by the Underlying Equipment, Through 2024 [Member]    
Debt Instrument [Line Items]    
Gross long-term debt, including current maturities   1,075
Notes Payable to Financial Institution, Due in Monthly Installments Collateralized by the Underlying Equipment, Through 2024 [Member]    
Debt Instrument [Line Items]    
Gross long-term debt, including current maturities   41,098
Notes Payable to Financial Institution, Quarterly, Through 2027 [Member]    
Debt Instrument [Line Items]    
Gross long-term debt, including current maturities $ 122,155 $ 139,100