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v3.21.1

Long-Term Debt, Financing Leases and Other Borrowings - Additional Information (Detail) |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 13, 2020 USD ($) | Nov. 12, 2020 USD ($) Air-craft | Oct. 30, 2020 USD ($) $ / shares shares | Sep. 25, 2019 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2021 USD ($) $ / shares | Mar. 31, 2020 USD ($) | Nov. 14, 2020 USD ($) | Sep. 30, 2020 USD ($) | Apr. 09, 2020 $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Property and equipment, net |  |  |  |  |  | $ 1,180,684,000 |  |  | $ 1,212,415,000 |
Long-Term Debt |  |  |  |  |  | 704,038,000 |  |  | $ 731,724,000 |
Proceeds from long-term debt |  |  |  |  |  | $ 195,000,000 | $ 23,000,000 |  |  |
Warrants of common stock exercise price | $ / shares |  |  |  |  |  | $ 0.004 |  |  |  | $ 3.98
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Calculated collateral coverage ratio |  |  | 1.6 |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Additional collateral coverage ratio |  |  | 1.6 |  |  |  |  |  |  |
Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Secured term loan facility, amount borrowed |  |  | $ 43,000,000 |  |  |  |  |  |  |
Secured term loan facility, additional amount borrowed | $ 152,000,000 |  |  |  |  |  |  |  |  |
Warrants to purchase shares of common stock | shares |  |  | 4,899,497 |  |  |  |  |  |  |
Warrants of common stock exercise price | $ / shares |  |  | $ 3.98 |  |  |  |  |  |  |
Debt issuance costs allocated to warrants |  |  |  |  |  | $ 100,000 |  |  |  |
Repayments of long term debt |  | $ 167,700,000 |  |  |  |  |  |  |  |
Number of aircraft financed | Air-craft |  | 44 |  |  |  |  |  |  |  |
Loan Agreement [Member] | $43M Treasury Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalized debt issuance costs, net |  |  | $ 700,000 |  |  |  |  |  |  |
Loan Agreement [Member] | $152M Treasury Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalized debt issuance costs, net | 2,300,000 |  |  |  |  |  |  |  |  |
Loan Agreement [Member] | EDC Loans [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuance costs | 3,100,000 |  |  |  |  |  |  |  |  |
Repayments of long term debt | 1,000,000.0 |  |  |  |  |  |  |  |  |
Payment of loans |  | $ 164,100,000 |  |  |  |  |  |  |  |
Discount for balance amount of loans |  | $ 3,600,000 |  |  |  |  |  |  |  |
Debt discount | 2,500,000 |  |  |  |  |  |  |  |  |
Equipment Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  | $ 162,200,000 |  |  |  |
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% |  |  |  |
Proceeds from long-term debt |  |  |  |  | $ 23,000,000.0 | $ 22,900,000 |  |  |  |
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] |  |  |  |  |  |  |  |  |  |
Long term debt interest rate description |  |  |  |  |  | three-month LIBOR plus 3.50% |  |  |  |
Long term debt, basis spread on variable rate |  |  | 3.50% |  |  |  |  |  |  |
Secured term loan facility, maximum borrowing capacity |  |  | $ 200,000,000.0 |  |  |  |  |  |  |
Secured term loan facility, amount borrowed |  |  | $ 43,000,000.0 |  |  |  |  |  |  |
Secured term loan facility, additional amount borrowed | 152,000,000.0 |  |  |  |  |  |  | $ 0 |  |
Debt instrument, maturity date |  |  | Oct. 30, 2025 |  |  | Oct. 30, 2025 |  |  |  |
Secured Term Loan Facility [Member] | Loan Agreement [Member] | $43M Treasury Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Secured term loan facility, amount borrowed |  |  | $ 43,000,000.0 |  |  |  |  |  |  |
Secured Term Loan Facility [Member] | Loan Agreement [Member] | $152M Treasury Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Secured term loan facility, additional amount borrowed | $ 152,000,000.0 |  |  |  |  |  |  | $ 0 |  |
Aircraft and Equipment [Member] | Pledged as Collateral [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Property and equipment, net |  |  |  |  |  | $ 1,060,000,000.0 |  |  |  |

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