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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:    
Net income (loss) $ (14,274) $ 14,118
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:    
Depreciation and amortization 21,028 20,470
Stock compensation expense 716 850
Loss on investments, net 6,462  
Deferred income taxes (4,224) 4,836
Amortization of deferred credits (213) (793)
Amortization of debt discount and issuance costs and accretion of interest into long-term debt 3,199 1,860
Gain on extinguishment of debt   (950)
Loss on disposal of assets 5 24
Provision for obsolete expendable parts and supplies 238 (37)
Changes in assets and liabilities:    
Receivables 248 (1,700)
Expendable parts and supplies (978) 256
Prepaid expenses and other operating assets and liabilities 2,094 4,296
Accounts payable 174 (5,723)
Deferred revenue (4,184) 53,999
Accrued expenses and other liabilities (4,868) (12,637)
Operating lease right-of-use assets and liabilities (672) 404
Net cash provided by operating activities 4,751 79,273
Cash flows from investing activities:    
Capital expenditures (19,775) (1,773)
Investments in equity securities (200)  
Payments of equipment and other deposits (6,954)  
Net cash used in investing activities (26,929) (1,773)
Cash flows from financing activities:    
Proceeds from long-term debt 30,811 195,000
Principal payments on long-term debt and finance leases (24,510) (189,131)
Payments of debt and warrant issuance costs (2,293) (1,257)
Repurchase of stock (15) (19)
Net cash provided by financing activities 3,993 4,593
Net change in cash, cash equivalents and restricted cash (18,185) 82,093
Cash, cash equivalents and restricted cash at beginning of period 123,867 102,841
Cash, cash equivalents and restricted cash at end of period 105,682 184,934
Supplemental cash flow information    
Cash paid for interest 2,815 6,743
Cash paid for income taxes, net   1
Operating lease payments in operating cash flows 10,152 9,304
Supplemental non-cash operating activities    
Right-of-use assets obtained in exchange for lease liabilities 4,190 69
Supplemental non-cash financing activities    
Debt issuance costs related to loan agreement with U.S. Department of the Treasury   $ (1,887)
Investments in warrants to purchase common stock 100  
Accrued capital expenditures $ 1,722