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Long-Term Debt and Other Borrowings - Additional Information (Detail) $ in Thousands |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2020 USD ($) | Sep. 27, 2019 USD ($) | Sep. 25, 2019 USD ($) | Jun. 14, 2019 USD ($) Air-craft | Jan. 28, 2019 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Property and equipment, net |  |  |  |  |  |  | $ 1,212,415 | $ 1,273,585 |  |
Long-Term Debt |  |  |  |  |  |  | 731,724 | 843,323 |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  | 3,616 |  |
Payment for debt extinguishment prepayment penalties |  |  |  |  |  |  |  | 1,672 |  |
Non-cash lease termination expense |  |  |  |  |  |  |  | 9,540 | $ 15,109 |
Proceeds from long-term debt |  |  |  |  |  |  | 23,000 | $ 171,658 | $ 187,703 |
Lease payment amount |  |  |  |  |  |  | 106,463 |  |  |
Export Development Canada [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal payments deferred |  |  |  |  |  |  | 28,000 |  |  |
Export Development Canada [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of existing aircraft debt | $ 145,000 |  |  |  |  |  |  |  |  |
Repayments of previously deferred principal payments | $ 19,900 |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from long-term debt |  |  |  |  |  |  | 23,000 |  |  |
Equipment Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | $ 172,100 |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 91,200 |  |  |  |  |
Long term debt interest rate description |  |  |  |  |  |  | LIBOR plus 3.10% |  |  |
Term loan, term |  |  |  |  | 5 years |  |  |  |  |
Write-off of financing cost |  |  |  |  | $ 1,900 |  |  |  |  |
Payment for debt extinguishment prepayment penalties |  |  |  |  | 1,700 |  |  |  |  |
Term Loan [Member] | Spare Engine Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long term debt interest rate description |  |  |  |  |  |  | LIBOR plus 7.25% |  |  |
Loss on extinguishment of debt |  |  |  |  | $ 3,600 |  |  |  |  |
Term Loan [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long term debt, basis spread on variable rate |  |  |  |  | 3.10% |  |  |  |  |
Term Loan [Member] | LIBOR [Member] | Spare Engine Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long term debt, basis spread on variable rate |  |  |  |  | 7.25% |  |  |  |  |
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2023 [Member] | CRJ-700 Aircraft [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 70,000 |  |  |  |  |  |
Long term debt interest rate description |  |  |  |  |  |  | LIBOR plus 5.00%. |  |  |
Number of aircraft purchased | Air-craft |  |  |  | 10 |  |  |  |  |  |
Payment for aircraft purchased |  |  |  | $ 70,000 |  |  |  |  |  |
Non-cash lease termination expense |  |  |  | $ 9,500 |  |  |  |  |  |
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2023 [Member] | LIBOR [Member] | CRJ-700 Aircraft [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long term debt, basis spread on variable rate |  |  |  | 5.00% |  |  |  |  |  |
Working Capital Draw Loan [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 35,000 |  |  |  |  |  |  |
Long term debt interest rate description |  |  |  |  |  |  | one-month LIBOR plus 3.75%. | one-month LIBOR plus 3.75%. |  |
Term loan, term |  |  | 3 years |  |  |  |  |  |  |
Proceeds from long-term debt |  |  |  |  |  | $ 23,000 | $ 23,000 |  |  |
Working Capital Draw Loan [Member] | LIBOR [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long term debt, basis spread on variable rate |  |  | 3.75% |  |  |  |  |  |  |
Aircraft and Equipment [Member] | Pledged as Collateral [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Property and equipment, net |  |  |  |  |  |  | $ 1,093,000 |  |  |
Flight Equipment [Member] | Notes Payable to Financial Institution Due 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 8,000 |  |  |  |  |  |  |  |
Long term debt interest rate description |  |  |  |  |  |  |  | Libor plus 5.0%. |  |
Flight Equipment [Member] | Notes Payable to Financial Institution Due 2023 [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long term debt, basis spread on variable rate |  | 5.00% |  |  |  |  |  |  |  |
RASPRO Aircraft Lease [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Lease payment amount |  |  |  |  |  |  |  |  |  | $ 4,000

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