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Leases - Additional Information Related to Leases (Details) - aircraft | Sep. 30, 2019 | Sep. 30, 2018
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Lessee, Lease, Description [Line Items] |  |
Weighted-average remaining lease term - operating leases | 11 years | 11 years
Weighted-average remaining lease term - finance leases | 5 years | 5 years
Weighted-average discount rate - operating leases | 5.30% | 5.20%
Weighted-average discount rate - finance leases | 44.80% | 39.50%
Embraer ERJ 145 |  |
Lessee, Lease, Description [Line Items] |  |
Number of leased aircraft |  | 54

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