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Long-Term Debt and Other Borrowings - Additional Information (Detail) $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 28, 2019 USD ($) | Aug. 14, 2018 USD ($) | Jun. 28, 2018 USD ($) Air-craft shares | Jun. 27, 2018 USD ($) Air-craft | Jun. 30, 2018 USD ($) | Mar. 31, 2019 USD ($) shares | Mar. 31, 2019 USD ($) shares | Sep. 30, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Property and equipment, net |  |  |  |  |  | $ 1,237,615 | $ 1,237,615 | $ 1,250,829
Long-Term Debt |  |  |  |  |  | $ 857,841 | $ 857,841 | $ 930,207
Warrants to purchase shares of common stock | shares |  |  |  |  |  | 250,000 | 250,000 |
CIT revolving credit facility outstanding |  | $ 25,700 |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  | $ 3,616 | $ 3,616 |
Payment for debt extinguishment prepayment penalties |  |  |  |  |  |  | 1,672 |
CRJ-900 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Refinanced debt |  |  |  | $ 16,000 |  |  |  |
Number of aircraft under refinanced debt | Air-craft |  |  | 6 | 6 |  |  |  |
Debt instrument, face amount |  |  | $ 69,600 | $ 27,500 |  |  |  |
Net cash proceeds after transaction related fees |  |  |  | $ 10,400 |  |  |  |
Long term debt interest rate description |  |  | LIBOR plus a spread ranging from 3.50% for the senior promissory notes to 7.50% for the subordinated promissory notes | LIBOR plus 3.50%. |  |  |  |
Long term debt, basis spread on variable rate |  |  |  | 3.50% |  |  |  |
Number of aircraft purchased | Air-craft |  |  | 9 |  |  |  |  |
Payment for aircraft purchased |  |  | $ 76,500 |  |  |  |  |
Number of aircraft financed | Air-craft |  |  | 6 | 6 |  |  |  |
Non-cash lease termination expense |  |  | $ 15,100 |  |  |  |  |
Future goods and services credits |  |  | 4,500 |  |  |  |  |
Loan forgiveness for loans |  |  | $ 5,600 |  |  |  |  |
Warrants to purchase shares of common stock | shares |  |  | 250,000 |  |  |  |  |
Equipment Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  | 200,300 | $ 200,300 |
Senior Notes Due 2020 [Member] | CRJ-900 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 67,300 |  |  |
Long term debt, basis spread on variable rate |  |  | 3.50% |  | 3.50% |  |  |
Senior Notes Due 2020 [Member] | CRJ-900 [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long term debt interest rate description |  |  |  |  |  |  | three-month LIBOR plus 3.50% |
Subordinated Notes Due 2020 [Member] | CRJ-900 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long term debt, basis spread on variable rate |  |  | 7.50% |  | 7.50% |  |  |
Subordinated Notes Due 2020 [Member] | CRJ-900 [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long term debt interest rate description |  |  |  |  |  |  | three month LIBOR plus 7.50% |
Term Loan |  |  |  |  |  |  |  |
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 | 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 | LIBOR [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long term debt, basis spread on variable rate | 3.10% |  |  |  |  |  |  |
Term Loan | LIBOR [Member] | Spare Engine Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long term debt, basis spread on variable rate | 7.25% |  |  |  |  |  |  |
Aircraft and Equipment [Member] | Pledged as Collateral [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Property and equipment, net |  |  |  |  |  | $ 1,125,900 | $ 1,125,900 |

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