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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2018
Accounting Policies [Abstract] |
Summary of Estimated Useful Lives of Various Classifications of Property and Equipment | Estimated useful lives of the various classifications of property and equipment are as follows:
Property and Equipment |  | Estimated Useful Life
Buildings |  | 30 years
Aircraft |  | 25 years from manufacture date
Flight equipment |  | 7-20 years
Equipment |  | 5-9 years
Furniture and fixtures |  | 3-5 years
Vehicles |  | 5 years
Rotable spare parts |  | Life of the aircraft or term of the lease, whichever is less
Leasehold improvements |  | Life of the aircraft or term of the lease, whichever is less

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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