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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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