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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash Flows From Operating Activities:    
Net income $ 13,861 $ 27,347
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization 47,611 45,220
Stock compensation expense 1,209 885
Deferred income taxes (22,139) 16,190
Amortization of unfavorable lease liabilities and deferred credits (8,295) (7,928)
Amortization of debt financing costs and accretion of interest on non-interest-bearing subordinated notes 3,577 1,328
Loss on disposal of assets 276 488
Provision for obsolete expendable parts and supplies 74 349
Loss on contract termination 15,109  
Provision for doubtful accounts   (86)
Changes in assets and liabilities:    
Receivables (12,743) (6,529)
Expendable parts and supplies (677) (2,265)
Prepaid expenses and other current assets 4,727 (14,773)
Accounts payable 8,361 (24,584)
Accrued liabilities 12,212 3,098
Net cash provided by operating activities 63,163 38,740
Cash Flows From Investing Activities:    
Capital expenditures (98,509) (64,819)
Proceeds from sale of rotable spare parts   18
Deposit of restricted cash (264) (69)
Net payments of lease and equipment deposits (2,673) (2,789)
Net cash used in investing activities (101,446) (67,659)
Cash Flows From Financing Activities:    
Proceeds from long-term debt 187,703 133,460
Principal payments on long-term debt and capital leases (158,170) (116,139)
Debt financing costs (5,767) (2,365)
Repurchase of stock (540) (803)
Net cash provided by financing activities 23,226 14,153
Net change in cash and cash equivalents (15,057) (14,766)
Cash and cash equivalents at beginning of period 56,788 37,686
Cash and cash equivalents at end of period $ 41,731 $ 22,920