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Long-Term Debt, Financing Leases and Other Borrowings - Schedule of Long-term Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | $ 821,773 | $ 858,145
Less unamortized debt issuance costs | (14,667) | (14,822)
Net long-term debt, including current maturities | 807,106 | 843,323
Less current portion | (166,089) | (165,900)
Net long-term debt | 641,017 | 677,423
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 45,019 | 49,795
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 57,867 | 60,761
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 | 107,940 | 110,912
Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 191,168 | 191,168
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 | 149,283 | 152,945
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 | 65,984 | 71,998
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 | 43,136 | 47,309
Notes Payable to Financial Institution, Collateralized by the Underlying Equipment, Due 2020 [Member] | Flight Equipment [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 1,244 | 1,659
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 | 5,358 | 6,962
Notes Payable to Financial Institution Due 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 1,822 | 2,329
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 | 8,162 | 8,530
Notes Payable to Financial Institution, Collateralized by the Underlying Equipment, Due 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 76,037 | 80,153
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 61,250 | 65,625
Notes Payable to Financial Institution Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | $ 7,503 | $ 8,000

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