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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:    
Net income (loss) $ (67,042) $ 24,083
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:    
Depreciation and amortization 61,878 62,108
Stock compensation expense 2,106 2,414
Loss on investments, net 12,649  
Deferred income taxes (19,137) 8,030
Amortization of deferred credits (639) (2,471)
Amortization of debt discount and issuance costs and accretion of interest into long-term debt 8,151 8,185
Lease termination   4,508
Impairment of assets held for sale 39,475  
Other 764 (732)
Changes in assets and liabilities:    
Receivables (883) 8,765
Expendable parts and supplies (2,418) (1,894)
Prepaid expenses and other operating assets and liabilities (1,519) 226
Accounts payable 4,367 (398)
Deferred heavy maintenance, net (4,536)  
Deferred revenue (11,780) 11,993
Accrued expenses and other liabilities (10,949) 15,436
Operating lease right-of-use assets and liabilities 3,097 (9,041)
Net cash provided by operating activities 13,584 131,212
Cash flows from investing activities:    
Capital expenditures (33,230) (10,717)
Investments in equity securities (200)  
Payments of equipment and other deposits (6,954) (6,954)
Returns of equipment and other deposits   632
Net cash used in investing activities (40,384) (17,039)
Cash flows from financing activities:    
Proceeds from long-term debt 35,311 195,000
Proceeds from issuance of common stock under ESPP 239 207
Principal payments on long-term debt and finance leases (71,993) (225,760)
Payments of debt and warrant issuance costs (2,414) (1,326)
Repurchase of stock (414) (1,385)
Net cash used in financing activities (39,271) (33,264)
Net change in cash, cash equivalents and restricted cash (66,071) 80,909
Cash, cash equivalents and restricted cash at beginning of period 123,867 102,841
Cash, cash equivalents and restricted cash at end of period 57,796 183,750
Supplemental cash flow information    
Cash paid for interest 14,695 22,905
Cash paid for income taxes, net 442 398
Operating lease payments in operating cash flows 31,069 37,640
Supplemental non-cash operating activities    
Right-of-use assets obtained in exchange for lease liabilities 5,481 454
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)
Debt discount on warrants issued with debt   11,678
Accrued capital expenditures $ 1,407 $ 59