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Leases - Additional Information (Detail) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) Air-craft | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2018 USD ($) | Sep. 23, 2005 USD ($) Airfleet
Operating Leased Assets [Line Items] |  |  |  |  |  |
Number of leased aircraft | Air-craft | 17 |  |  |  |  |
Aggregate rental expense under all operating aircraft, equipment and facility leases | $ 44,600 | $ 51,400 | $ 57,300 |  |  |
Operating lease, right-of-use assets | 93,100 | 123,251 |  |  |  |
Operating lease current liabilities | 32,652 | 43,932 |  |  |  |
Operating lease noncurrent liabilities | 33,991 | 62,531 |  |  |  |
Operating lease payments in operating cash flows | 47,612 | 44,173 |  |  |  |
Cash, cash equivalents and availability under lines of credit | 123,867 | 102,841 | $ 72,501 |  | $ 107,134 |
Deferred income taxes | $ 69,940 | $ 64,275 |  |  |  |
RASPRO Aircraft Lease Agreement [Member] |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Deferred income taxes |  |  |  | $ 4,000 |  |
CRJ-900 Aircraft [Member] | RASPRO Aircraft Lease Agreement [Member] |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Number of leased aircraft | Airfleet |  |  |  |  |  | 15
Cash, cash equivalents and availability under lines of credit |  |  |  |  |  | $ 35,000

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