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Leases - Additional Information Related to Leases (Details) - aircraft	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018
Lessee, Lease, Description [Line Items]
Weighted-average remaining lease term - operating leases	10 years		10 years
Weighted-average remaining lease term - finance leases	5 years		5 years
Weighted-average discount rate - operating leases	5.30%		5.10%
Weighted-average discount rate - finance leases	53.20%		6.70%
Embraer ERJ 145
Lessee, Lease, Description [Line Items]
Number of leased aircraft		54

X

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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