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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Cash Flows From Operating Activities:      
Net income $ 33,255,000 $ 32,828,000 $ 14,920,000
Adjustments to reconcile net income to net cash flows provided by operating activities:      
Depreciation and amortization 65,031,000 61,048,000 46,020,000
Stock compensation expense 12,929,000 1,288,000 1,546,000
Deferred income taxes (17,874,000) 20,515,000 9,513,000
Amortization of unfavorable lease liabilities and deferred credits (11,035,000) (10,626,000) (9,626,000)
non-interest-bearing subordinated notes 4,606,000 2,689,000 1,990,000
Loss on disposal of assets 307,000 533,000 428,000
Provision for obsolete expendable parts and supplies 200,000 419,000 41,000
Lease termination 15,109,000    
Provision for doubtful accounts   (86,000) 575,000
Changes in assets and liabilities:      
Receivables (5,437,000) 530,000 1,908,000
Expendable parts and supplies (744,000) (3,379,000) (1,675,000)
Prepaid expenses and other current assets 7,584,000 (17,243,000) 1,554,000
Accounts payable 2,427,000 (17,336,000) 29,673,000
Accrued liabilities 12,581,000 3,547,000 7,625,000
Net cash provided by operating activities 118,939,000 74,727,000 104,492,000
Cash Flows Used In Investing Activities:      
Capital expenditures (117,989,000) (84,500,000) (490,081,000)
Purchases of investment securities (19,921,000)    
Proceeds from sale of rotable spare parts   18,000 196,000
Withdrawal (deposit) of restricted cash (264,000) (46,000) 807,000
Net returns (payments) of lease and equipment deposits (653,000) 406,000 (2,049,000)
Net cash used in investing activities (138,827,000) (84,122,000) (491,127,000)
Cash Flows From Financing Activities:      
Proceeds from long-term debt 187,703,000 185,912,000 452,841,000
Principal payments on long-term debt and capital leases (222,153,000) (152,995,000) (75,496,000)
Debt financing costs (5,852,000) (3,377,000) (10,086,000)
Proceeds from issuance of common stock 124,246,000    
Stock issuance costs (12,540,000)    
Repurchase of stock (4,993,000) (1,043,000) (1,411,000)
Net cash provided by financing activities 66,411,000 28,497,000 365,848,000
Net change in cash and cash equivalents 46,523,000 19,102,000 (20,787,000)
Cash and cash equivalents at beginning of period 56,788,000 37,686,000 58,473,000
Cash and cash equivalents at end of period 103,311,000 56,788,000 37,686,000
Supplemental cash flow information      
Cash paid for interest 50,672,000 43,798,000 28,693,000
Cash paid for income taxes - net 385,000 332,000 196,000
Supplemental non-cash investing and financing activities      
Accrued capital expenditures 16,677,000 $ 9,533,000 $ 418,000
Acquisition of capital leases $ 10,473,000