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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net income $ 24,083 $ 16,089
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization 62,108 61,656
Stock compensation expense 2,414 3,533
Deferred income taxes 8,030 5,902
Long-term deferred revenue   12,240
Amortization of deferred credits (2,471) (2,928)
Amortization of debt discount and issuance costs 8,185 3,182
Gain on extinguishment of debt (950)  
Loss on disposal of assets 50 528
Provision for obsolete expendable parts and supplies 168 287
Lease termination 4,508  
Changes in assets and liabilities:    
Receivables 8,765 8,462
Expendable parts and supplies (1,894) (1,403)
Prepaid expenses and other assets 226 (1,257)
Accounts payable (398) (9,890)
Deferred revenue 11,993  
Accrued expenses and other liabilities 15,436 11,659
Change in operating lease right-of-use assets and liabilities (9,041) (4,459)
Net cash provided by operating activities 131,212 103,601
Cash flows from investing activities:    
Capital expenditures (10,717) (25,160)
Net returns (payments) on equipment & other deposits (6,322) 46
Net cash used in investing activities (17,039) (25,114)
Cash flows from financing activities:    
Proceeds from long-term debt 195,000 23,000
Proceeds from issuance of common stock under ESPP 207  
Principal payments on long-term debt and financing leases (225,760) (103,718)
Payments of debt and warrant issuance costs (1,326) (1,394)
Repurchase of stock (1,385) (498)
Net cash used in financing activities (33,264) (82,610)
Net change in cash, cash equivalents and restricted cash 80,909 (4,123)
Cash, cash equivalents and restricted cash at beginning of period 102,841 72,501
Cash, cash equivalents and restricted cash at end of period 183,750 68,378
Supplemental cash flow information    
Cash paid for interest 22,905 30,375
Cash paid for income taxes, net 398 45
Operating lease payments in operating cash flows 37,640 34,919
Supplemental non-cash transactions    
Warrants received for entering into agreements with Archer Aviation Inc. ("Archer") 16,374  
Right-of-use assets obtained 454 145,054
Debt issuance cost related to loan agreement with US Department of the Treasury (1,887)  
Accrued capital expenditures $ 59 $ 60