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Long-Term Debt, Finance Leases, and Other Borrowings - Schedule of Long-term Debt (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | $ 651,950 | $ 670,335
Less unamortized debt issuance costs | (10,368) | (9,295)
Less notes payable warrants | (8,454) | (9,630)
Net long-term debt, including current maturities | 633,128 | 651,410
Less current portion, net of unamortized debt issuance costs | (111,671) | (111,710)
Net long-term debt | 521,457 | 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 | 80,244 | 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 | 141,690 | 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 | 114,883 | 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 | 3,448 | 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 | 36,290 | 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 | 21,875 | 30,625
Notes Payable to Financial Institution Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 3,000 | 4,000
Notes Payable to U.S Treasury Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 204,947 | $ 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 | $ 29,943 |

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