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Long-Term Debt and Other Borrowings - Schedule of Long-term Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Total long-term debt | $ 930,207 | $ 956,918
Less current portion | (155,170) | (140,466)
Less unamortized debt issuance costs | (14,860) | (12,578)
Long-term debt—excluding current portion | 760,177 | 803,874
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 4,428 | 58,254
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 69,340 | 113,611
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 72,438 | 82,776
Senior and Subordinated Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 122,591 | 137,028
Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 209,240 | 226,399
Senior and Subordinated Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 167,269 | 181,115
Senior and Subordinated Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 95,060 |
Senior and Subordinated Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2022 [Member] | CRJ-900 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 63,403 |
Notes Payable to Financial Institution, Collateralized by the Underlying Equipment, Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 88,162 | 93,031
Notes Payable to Financial Institution, Collateralized by the Underlying Equipment, Due 2020 [Member] | Flight Equipment [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 3,318 | 4,976
Notes Payable to Financial Institution, Collateralized by the Underlying Equipment, Due 2020 [Member] | Flight Equipment Maintenance [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 14,971 | 9,158
Notes Payable to Financial Institution Due 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 4,360 | 6,390
Notes Payable to Financial Institution Due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 5,896 | 18,530
Working Capital Draw Loan, Collateralized by Certain Flight Equipment and Spare Parts [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt |  | $ 25,650
Other Obligations Due to Financial Institution, Collateralized by the Underlying Equipment, Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | $ 9,731 |

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