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Long-Term Debt, Finance Leases and Other Borrowings - Schedule of Long-term Debt (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | $ 713,656 | $ 743,250
Less unamortized debt issuance costs | (9,948) | (11,526)
Less Notes payable warrants | (10,219) |
Net long-term debt, including current maturities | 693,489 | 731,724
Less current portion | (107,728) | (189,268)
Net long-term debt | 585,761 | 542,456
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 22,930 | 22,930
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities |  | 41,472
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities |  | 55,674
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 | 106,198 | 105,887
Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 162,247 | 172,137
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 | 126,650 | 138,114
Senior and Subordinated Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities |  | 47,319
Senior and Subordinated Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2022 [Member] | CRJ-900 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities |  | 29,682
Notes Payable to Financial Institution Due 2020 [Member] | Flight Equipment Maintenance [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 1,523 | 1,523
Notes Payable to Financial Institution, Collateralized by the Underlying Equipment, Due 2020 [Member] | Flight Equipment Maintenance [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities |  | 4,182
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 | 5,128 | 6,864
Notes Payable to Financial Institution, Collateralized by the Underlying Equipment, Due 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 50,097 | 63,341
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 35,000 | 48,125
Notes Payable to Financial Institution Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 4,500 | $ 6,000
Notes Payable to Financial Institution Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | $ 199,383 |

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