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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net income (loss) $ (57,057) $ 19,807
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:    
Depreciation and amortization 41,775 41,175
Stock compensation expense 1,387 1,658
Loss on investments, net 8,723  
Deferred income taxes (16,659) 6,654
Amortization of deferred credits (426) (2,258)
Amortization of debt discount and issuance costs and accretion of interest into long-term debt 6,605 4,994
Lease termination   4,508
Impairment of assets held for sale 39,475  
Other 910 (903)
Changes in assets and liabilities:    
Receivables (3,682) (155)
Expendable parts and supplies (2,249) (84)
Prepaid expenses and other operating assets and liabilities (1,741) (1,988)
Accounts payable 14,413 15,470
Deferred heavy maintenance, net (2,430)  
Deferred revenue (4,957) 10,099
Accrued expenses and other liabilities (7,048) (14,092)
Operating lease right-of-use assets and liabilities (7,081) (6,311)
Net cash provided by operating activities 9,958 78,574
Cash flows from investing activities:    
Capital expenditures (22,850) (5,261)
Investments in equity securities (200)  
Payments of equipment and other deposits (6,954) (6,954)
Returns of equipment and other deposits   540
Net cash used in investing activities (30,004) (11,675)
Cash flows from financing activities:    
Proceeds from long-term debt 30,811 195,000
Proceeds from issuance of common stock under ESPP 239  
Principal payments on long-term debt and finance leases (53,135) (212,020)
Payments of debt and warrant issuance costs (2,414) (1,326)
Repurchase of stock (75) (176)
Net cash used in financing activities (24,574) (18,522)
Net change in cash, cash equivalents and restricted cash (44,620) 48,377
Cash, cash equivalents and restricted cash at beginning of period 123,867 102,841
Cash, cash equivalents and restricted cash at end of period 79,247 151,218
Supplemental cash flow information    
Cash paid for interest 9,464 16,922
Cash paid for income taxes, net 176 49
Operating lease payments in operating cash flows 26,224 25,716
Supplemental non-cash operating activities    
Right-of-use assets obtained (disposed) in exchange for lease liabilities 4,870 (320)
Supplemental non-cash financing activities    
Investments in warrants to purchase common stock 3,260 16,374
Debt issuance cost related to loan agreement with US Department of the Treasury   $ (1,887)
Accrued capital expenditures $ 1,283