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Leases and Commitments - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) Air-craft | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) Air-craft Engine | Jun. 30, 2019 USD ($) | Oct. 01, 2019 USD ($)
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease, right-of-use assets | $ 131,480 |  | $ 131,480 |  |
Number of leased aircraft | Air-craft | 18 |  | 18 |  |
Aggregate rental expense under all operating aircraft, equipment and facility leases | $ 15,600 | $ 18,100 | $ 51,000 | $ 55,900 |
Operating lease current liabilities | 43,219 |  | 43,219 |  |
Operating lease noncurrent liabilities | 71,068 |  | 71,068 |  |
Operating lease payments in operating cash flows |  |  | 34,919 |  |
CF34-8C5 Engine [Member] | Letter Agreement [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Purchase commitment amount | $ 108,000 |  | $ 108,000 |  |
CF34-8C5 Engine [Member] | Letter Agreement No. 13-1 [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Number of new spare engines to be acquired | Engine |  |  | 20 |  |
New spare engines delivery month and year description |  |  | Under Letter Agreement No. 13-1, the Company has agreed to purchase and take delivery of 20 new spare CF34-8C5 engines. Delivery of the new spare engines will now commence in April 2021, with the final spare engine being delivered in December 2021. |  |
New Spare engines payments commencing month and year description |  |  | The payment terms for the new spare engines were also amended, with payments to now be made in four (4) separate tranches commencing in October and December 2020 and February and March 2021. |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease, right-of-use assets |  |  |  |  | $ 154,600
Operating lease, liability |  |  |  |  | 141,900
Accounting Standards Update 2016-02 [Member] | Prepaid Aircraft Rent [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease, right-of-use assets |  |  |  |  | 35,800
Accounting Standards Update 2016-02 [Member] | Deferred Rent Credits [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease, right-of-use assets |  |  |  |  | 21,300
Accounting Standards Update 2016-02 [Member] | Accrued Aircraft Rents [Member] |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease, right-of-use assets |  |  |  |  | $ 1,800

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