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Long-Term Debt, Finance Leases, and Other Borrowings - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Oct. 30, 2020 | Sep. 25, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021
Debt Instrument [Line Items] |  |  |  |  |
Property and equipment, net |  |  | $ 1,157,922,000 |  | $ 1,151,891,000
Long-Term Debt |  |  | $ 658,468,000 |  | $ 651,410,000
Warrants of common stock exercise price |  |  | $ 3.98 |  |
Treasury Loan [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Calculated collateral coverage ratio | 1.6 |  |  |  |
Treasury Loan [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Additional collateral coverage ratio | 1.6 |  |  |  |
Loan Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Warrants to purchase shares of common stock | 4,899,497 |  |  |  |
Warrants of common stock exercise price | $ 3.98 |  |  |  |
Spare Engine Facility [Member] | Loan Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount |  |  | $ 30,800,000 |  |
Long term debt interest rate description |  |  | LIBOR plus 4.25% |  |
Secured term loan facility, maximum borrowing capacity |  |  | $ 54,000,000.0 |  |
Debt instrument, maturity date |  |  | Dec. 31, 2027 |  |
Spare Engine Facility [Member] | LIBOR [Member] | Loan Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long term debt, basis spread on variable rate |  |  | 4.25% |  |
Equipment Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-Term Debt |  |  | $ 152,100,000 |  |
Working Capital Draw Loan [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount |  | $ 35,000,000.0 |  |  |
Term loan, term |  | 3 years |  |  |
Debt instrument, expiration year and month |  | 2022-09 |  |  |
Long term debt interest rate description |  |  | one-month LIBOR plus 3.75% | one-month LIBOR plus 3.75% |
Outstanding balance repaid |  |  | $ 7,300,000 |  |
Outstanding remaining on revolving credit facility |  | $ 15,600,000 |  |  |
Working Capital Draw Loan [Member] | Revolving Credit Facility [Member] | LIBOR [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long term debt, basis spread on variable rate |  | 3.75% |  |  |
Secured Term Loan Facility [Member] | Loan Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured term loan facility, maximum borrowing capacity | $ 200,000,000.0 |  |  |  |
Debt instrument, maturity date |  |  | Oct. 30, 2025 |  |
Secured Term Loan Facility [Member] | Loan Agreement [Member] | Treasury Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long term debt, basis spread on variable rate | 3.50% |  |  |  |
Secured term loan facility, amount borrowed |  |  |  | $ 195,000,000.0 |
Secured term loan facility, additional amount borrowed |  |  | $ 0 |  |
Debt instrument, maturity date | Oct. 30, 2025 |  |  |  |
Aircraft and Equipment [Member] | Pledged as Collateral [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Property and equipment, net |  |  | $ 1,082,000,000.0 |  |

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