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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:      
Net income $ 16,588 $ 27,464 $ 47,580
Adjustments to reconcile net income to net cash flows provided by operating activities:      
Depreciation and amortization 82,847 82,296 77,994
Stock compensation expense 3,126 4,414 5,508
Loss on investments, net 6,816    
Deferred income taxes 5,665 9,234 15,503
Amortization of deferred credits (2,357) (3,742) (5,121)
Unfavorable lease liabilities     (5,718)
Amortization of debt discount and issuance costs and accretion of interest into long-term debt 11,379 4,202 4,203
Loss (gain) on extinguishment of debt (950)   3,616
Loss (gain) on disposal of assets 78 401 (5)
Provision for obsolete expendable parts and supplies 380   642
Lease termination 4,508   9,540
Changes in assets and liabilities:      
Receivables 10,545 9,368 (9,275)
Expendable parts and supplies (1,865) (1,529) (6,310)
Prepaid expenses and other operating assets and liabilities (56) (1,368) (713)
Accounts payable 7,861 3,418 12,119
Deferred heavy maintenance, net (3,857)    
Deferred revenue 10,742 23,758  
Accrued expenses and other liabilities (8,911) 20,801 2,113
Change in operating lease right-of-use assets and liabilities (9,668) (4,055)  
Net cash provided by operating activities 132,871 174,662 151,676
Cash flows from investing activities:      
Capital expenditures (17,149) (26,667) (125,350)
Investments in equity securities (10,000)    
Purchases of short-term investment securities     (14,884)
Sales of short-term investment securities     34,961
Net returns (payments) on equipment & other deposits (6,322)   431
Net cash used in investing activities (33,471) (26,667) (104,842)
Cash flows from financing activities:      
Proceeds from long-term debt 195,000 23,000 171,658
Principal payments on long-term debt and finance leases (271,033) (138,289) (244,087)
Payments of debt and warrant issuance costs (1,326) (1,780) (5,680)
Debt prepayment costs     (1,672)
Proceeds from issuance of common stock under ESPP 471    
Stock issuance costs     185
Repurchase of stock (1,486) (586) (1,871)
Net cash used in financing activities (78,374) (117,655) (81,467)
Net change in cash, cash equivalents and restricted cash 21,026 30,340 (34,633)
Cash, cash equivalents and restricted cash at beginning of period 102,841 72,501 107,134
Cash, cash equivalents and restricted cash at end of period 123,867 102,841 72,501
Supplemental cash flow information      
Cash paid for interest 32,767 41,501 53,503
Cash paid for income taxes, net 404 398 419
Operating lease payments in operating cash flows 47,612 44,173  
Supplemental disclosure of non-cash transactions      
Right-of-use assets obtained in exchange for lease liabilities 4,309 145,054  
Accrued capital expenditures 439 $ 61 $ 179
Warrants received for entering into agreements with Archer Aviation Inc. ("Archer") 21,964    
Debt issuance cost related to loan agreement with U.S. Department of the Treasury $ (1,887)