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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