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Long-Term Debt and Other Borrowings - Schedule of Long-term Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Total long-term debt | $ 891,692 | $ 930,207
Less current portion | (149,842) | (155,170)
Less unamortized debt issuance costs | (14,011) | (14,860)
Long-term debt—excluding current portion | 727,839 | 760,177
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 1,780 | 4,428
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 63,784 | 69,340
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 69,231 | 72,438
Senior and Subordinated Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 119,701 | 122,591
Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 209,240 | 209,240
Senior and Subordinated Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 163,734 | 167,269
Senior and Subordinated Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 89,440 | 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 | 59,467 | 63,403
Notes Payable to Financial Institution, Collateralized by the Underlying Equipment, Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 84,872 | 88,162
Notes Payable to Financial Institution, Collateralized by the Underlying Equipment, Due 2020 [Member] | Flight Equipment [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 2,903 | 3,318
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 | 12,159 | 14,971
Notes Payable to Financial Institution Due 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 3,852 | 4,360
Notes Payable to Financial Institution Due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 2,088 | 5,896
Other Obligations Due to Financial Institution, Collateralized by the Underlying Equipment, Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | $ 9,441 | $ 9,731

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