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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income $ 32,330 $ 24,996
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization 37,767 31,598
Stock compensation expense 2,752 819
Deferred income taxes 10,039 (18,646)
Amortization of unfavorable lease liabilities and deferred credits (5,670) (5,552)
Amortization of debt financing costs and accretion of interest on non-interest-bearing subordinated notes 2,000 2,636
Loss on extinguishment of debt 3,616  
(Gain) loss on disposal of assets (33) 198
Provision for obsolete expendable parts and supplies 319 62
Changes in assets and liabilities:    
Receivables 1,734 (8,158)
Expendable parts and supplies (3,890) (390)
Prepaid expenses and other current assets (7,244) 9,428
Accounts payable (3,451) 6,685
Accrued liabilities (499) (2,468)
Net cash provided by operating activities 69,770 41,208
Cash flows from investing activities:    
Capital expenditures (34,250) (16,978)
Sales of investment securities 20,077  
Net returns of lease and equipment deposits (4,318) 23
Net cash used in investing activities (18,491) (16,955)
Cash flows from financing activities:    
Proceeds from long-term debt 91,200 85,441
Principal payments on long-term debt and capital leases (163,748) (110,836)
Debt financing costs (2,540) (2,678)
Stock issuance costs 185  
Repurchase of stock (449)  
Debt prepayment costs (1,672)  
Net cash used in financing activities (77,024) (28,073)
Net change in cash, cash equivalents and restricted cash (25,745) (3,820)
Cash, cash equivalents and restricted cash at beginning of period 107,134 60,347
Cash, cash equivalents and restricted cash at end of period 81,389 56,527
Supplemental cash flow information    
Cash paid for interest 27,937 24,509
Cash paid for income taxes, net 51 46
Supplemental non-cash investing and financing activities    
Accrued capital expenditures $ 6,345  
Acquisition of capital leases   $ 10,473