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Long-Term Debt and Other Borrowings - Schedule of Long-term Debt (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Total long-term debt | $ 994,102 | $ 956,918
Less current portion | (149,936) | (140,466)
Less unamortized debt issuance costs | (15,679) | (12,578)
Long-term debt-excluding current portion | 828,487 | 803,874
Total long-term debt | 994,102 | 956,918
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 7,049 | 58,254
Total long-term debt | 7,049 | 58,254
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 72,839 | 113,611
Total long-term debt | 72,839 | 113,611
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 74,822 | 82,776
Total long-term debt | 74,822 | 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 | 125,460 | 137,028
Total long-term debt | 125,460 | 137,028
Notes Payable to Secured Parties, Collateralized by the Underlying Aircraft, Due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 217,930 | 226,399
Total long-term debt | 217,930 | 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 | 170,777 | 181,115
Total long-term debt | 170,777 | 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 | 97,069 |
Total long-term debt | 97,069 |
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 | 67,282 |
Total long-term debt | 67,282 |
Notes Payable to Financial Institution, Collateralized by the Underlying Equipment, Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 89,807 | 93,031
Total long-term debt | 89,807 | 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 | 3,732 | 4,976
Total long-term debt | 3,732 | 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 | 17,749 | 9,158
Total long-term debt | 17,749 | 9,158
Notes Payable to Financial Institution Due 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 4,867 | 6,390
Total long-term debt | 4,867 | 6,390
Notes Payable to Financial Institution Due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 9,055 | 18,530
Total long-term debt | 9,055 | 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 | 25,650
Total long-term debt | 25,650 | $ 25,650
Other Obligations Due to Financial Institution, Collateralized by the Underlying Equipment, Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 10,014 |
Total long-term debt | $ 10,014 |

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