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Long-Term Debt, Finance Leases, and Other Borrowings - Schedule of Long-term Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | $ 678,586 | $ 670,335
Less unamortized debt issuance costs | (11,083) | (9,295)
Less notes payable warrants | (9,035) | (9,630)
Net long-term debt, including current maturities | 658,468 | 651,410
Less current portion, net of unamortized debt issuance costs | (111,059) | (111,710)
Net long-term debt | 547,409 | 539,700
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 15,630 | 22,930
Senior and Subordinated Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 83,409 | 86,551
Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 152,100 | 152,100
Senior and Subordinated Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 118,840 | 122,762
Other Obligations Due to Financial Institution, Collateralized by the Underlying Equipment, Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 4,021 | 4,581
Notes Payable to Financial Institution, Collateralized by the Underlying Equipment, Due 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 40,956 | 45,559
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 26,250 | 30,625
Notes Payable to Financial Institution Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 3,500 | 4,000
Notes Payable to U.S Treasury Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 203,069 | $ 201,227
Notes Payable to Financial Institution, Collateralized by the Underlying Equipment, Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | $ 30,811 |

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