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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:      
Net (loss) income $ (182,678) $ 16,588 $ 27,464
Adjustments to reconcile net (loss) income to net cash flows provided by operating activities:      
Depreciation and amortization 81,508 82,847 82,296
Stock compensation expense 2,761 3,126 4,414
Loss on investments, net 13,715 6,816  
Deferred income taxes (52,221) 5,665 9,234
Asset impairment 171,824    
Amortization of deferred credits (852) (2,357) (3,742)
Amortization of debt discount and issuance costs and accretion of interest into long-term debt 9,681 11,379 4,202
Loss (gain) on extinguishment of debt 397 (950)  
Loss (gain) on disposal of assets (4,723) 78 401
Provision for obsolete expendable parts and supplies 634 380  
Lease termination 233 4,508  
Changes in assets and liabilities:      
Receivables (811) 10,545 9,368
Expendable parts and supplies (2,882) (1,865) (1,529)
Prepaid expenses and other operating assets and liabilities (679) (56) (1,368)
Accounts payable (2,772) 7,861 3,418
Deferred heavy maintenance, net (8,066) (3,857)  
Deferred revenue (10,432) 10,742 23,758
Accrued expenses and other liabilities (3,175) (8,911) 20,801
Change in operating lease right-of-use assets and liabilities 1,900 (9,668) (4,055)
Net cash provided by operating activities 13,362 132,871 174,662
Cash flows from investing activities:      
Capital expenditures (40,814) (17,149) (26,667)
Proceeds from sale of flight equipment and expendable inventory 50,000    
Investments in equity securities (200) (10,000)  
Net payments on equipment & other deposits (7,621) (6,322)  
Net cash provided by (used in) investing activities 1,365 (33,471) (26,667)
Cash flows from financing activities:      
Proceeds from long-term debt 39,811 195,000 23,000
Principal payments on long-term debt and finance leases (114,910) (271,033) (138,289)
Payments of debt and warrant issuance costs (2,414) (1,326) (1,780)
Proceeds from issuance of common stock under ESPP 399 471  
Repurchase of stock (455) (1,486) (586)
Net cash used in financing activities (77,569) (78,374) (117,655)
Net change in cash, cash equivalents and restricted cash (62,842) 21,026 30,340
Cash, cash equivalents and restricted cash at beginning of period 123,867 102,841 72,501
Cash, cash equivalents and restricted cash at end of period 61,025 123,867 102,841
Supplemental cash flow information      
Cash paid for interest 24,895 32,767 41,501
Cash paid for income taxes, net 487 404 398
Operating lease payments in operating cash flows 36,262 47,612 44,173
Supplemental disclosure of non-cash operating activities      
Right-of-use assets obtained in exchange for lease liabilities 6,286 4,309 145,054
Supplemental disclosure of non-cash financing activities      
Accrued capital expenditures 1,121 439 $ 61
Acquisition of finance leases 15,122    
Investments in warrants to purchase common stock $ 3,260 21,964  
Debt issuance cost related to loan agreement with U.S. Department of the Treasury   $ (1,887)