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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net income $ 16,089 $ 35,337
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization 61,656 57,528
Stock compensation expense 3,533 4,259
Deferred income taxes 5,902 10,898
Long-term deferred revenue 12,240  
Amortization of deferred credits (2,928) (3,854)
Unfavorable lease liabilities   (4,525)
Amortization of debt financing costs and accretion of interest on non-interest-bearing subordinated notes 3,182 3,147
Loss on extinguishment of debt   3,616
Loss (Gain) on disposal of assets 528 (49)
Provision for obsolete expendable parts and supplies 287 477
Loss on lease termination   9,540
Changes in assets and liabilities:    
Receivables 8,462 5,903
Expendable parts and supplies (1,403) (5,076)
Prepaid expenses and other current assets (1,257) (7,861)
Accounts payable (9,890) (4,888)
Accrued liabilities 11,659 9,625
Change in operating lease right-of-use assets (4,459)  
Net cash provided by operating activities 103,601 114,077
Cash flows from investing activities:    
Capital expenditures (25,160) (116,731)
Sales of investment securities   20,077
Lease and equipment deposits (13,804) 621
Returns of lease and equipment deposits 13,850  
Net cash used in investing activities (25,114) (96,033)
Cash flows from financing activities:    
Proceeds from long-term debt 23,000 163,658
Principal payments on long-term debt and financing leases (103,718) (197,409)
Debt financing costs (1,394) (4,870)
Debt prepayment costs   (1,672)
Stock issuance costs   185
Repurchase of stock (498) (1,514)
Net cash used in financing activities (82,610) (41,622)
Net change in cash, cash equivalents and restricted cash (4,123) (23,578)
Cash, cash equivalents and restricted cash at beginning of period 72,501 107,134
Cash, cash equivalents and restricted cash at end of period 68,378 83,556
Supplemental cash flow information    
Cash paid for interest 30,375 37,587
Cash paid for income taxes, net 45 415
Operating lease payments in operating cash flows 34,919  
Supplemental non-cash operating activities    
Right-of-use assets obtained in exchange of lease liabilities 145,054  
Supplemental non-cash investing activities    
Accrued capital expenditures $ 60 $ 836