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v3.23.1

Long-Term Debt, Finance Leases, and Other Borrowings - Schedule of Long-term Debt (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | $ 621,586 | $ 615,310
Less unamortized debt issuance costs | (6,798) | (8,303)
Less notes payable warrants | (6,096) | (7,272)
Net long-term debt, including current maturities | 608,692 | 599,735
Less current portion, net of unamortized debt issuance costs | (145,046) | (97,218)
Net long-term debt | 463,646 | 502,517
Revolving credit facility quaterly collateralized by underlying equipment and investments through two thousand twenty eight [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 30,630 | 15,630
Senior and Subordinated Notes Payable to Secured Parties, Due in Monthly Installments Collateralized by the Underlying Aircraft Through 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 68,521 | 73,850
Notes Payable to Secured Parties, Due in Semi Annual Installments Collateralized by the Underlying Aircraft Through 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 120,054 | 131,010
Notes Payable to Secured Parties, Due in Quarterly Installments Collateralized by the Underlying Aircraft Through 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 98,705 | 106,865
United Bridge Loan Quaterly Collateralized By Underlying Equipment And Investments Through Two Thousand Twenty Four [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 10,500 |
Other Obligations Due to Financial Institutions, Monthly or Quarterly Collateralized by the Underlying Equipment, Due 2022 Through 2031 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 76,250 | 18,038
Notes Payable to Financial Institution, Due in Monthly Installments Collateralized by the Underlying Equipment, Through 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 12,389 | 26,758
Notes Payable to Financial Institution, Due in Monthly Installments Secured by Flight Equipment, Through 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities |  | 2,000
Notes Payable to Financial Institution, Quarterly, Through 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | 158,760 | 204,947
Notes Payable to Financial Institution, Due in Monthly Installments Collateralized by the Underlying Equipment, Through 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Gross long-term debt, including current maturities | $ 45,777 | $ 36,212

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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