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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:      
Net income $ 27,464,000 $ 47,580,000 $ 33,255,000
Adjustments to reconcile net income to net cash flows provided by operating activities:      
Depreciation and amortization 82,296,000 77,994,000 65,031,000
Stock compensation expense 4,414,000 5,508,000 12,929,000
Deferred income taxes 9,234,000 15,503,000 (17,874,000)
Long-term deferred revenue 14,369,000    
Amortization of deferred credits (3,742,000) (5,121,000) (4,395,000)
Unfavorable lease liabilities   (5,718,000) (6,640,000)
Amortization of debt financing costs and accretion of interest on non-interest-bearing subordinated notes 4,202,000 4,203,000 4,606,000
Loss on extinguishment of debt   3,616,000  
Loss/(Gain) on disposal of assets 401,000 (5,000) 307,000
Provision for obsolete expendable parts and supplies   642,000 200,000
Loss on lease termination   9,540,000 15,109,000
Changes in assets and liabilities:      
Receivables 9,368,000 (9,275,000) (5,437,000)
Expendable parts and supplies (1,529,000) (6,310,000) (744,000)
Prepaid expenses and other current assets (1,368,000) (713,000) 7,584,000
Accounts payable 3,418,000 12,119,000 2,427,000
Accrued liabilities 30,190,000 2,113,000 12,581,000
Change in operating activity of ROU asset (4,055,000)    
Net cash provided by operating activities 174,662,000 151,676,000 118,939,000
Cash flows from investing activities:      
Capital expenditures (26,667,000) (125,350,000) (117,989,000)
Purchases of investment securities   (14,884,000) (19,921,000)
Sales of investment securities   34,961,000  
Net returns (payments) on equipment & other deposits   431,000 (653,000)
Net cash used in investing activities (26,667,000) (104,842,000) (138,563,000)
Cash flows from financing activities:      
Proceeds from long-term debt 23,000,000 171,658,000 187,703,000
Principal payments on long-term debt and finance leases (138,289,000) (244,087,000) (222,153,000)
Debt financing costs (1,780,000) (5,680,000) (5,852,000)
Debt prepayment costs   (1,672,000)  
Proceeds from issuance of common stock     124,246,000
Stock issuance costs   185,000 (12,540,000)
Repurchase of stock (586,000) (1,871,000) (4,993,000)
Net cash (used in) provided by financing activities (117,655,000) (81,467,000) 66,411,000
Net change in cash and cash equivalents 30,340,000 (34,633,000) 46,787,000
Cash and cash equivalents and restricted cash at beginning of period 72,501,000 107,134,000 60,347,000
Cash and cash equivalents and restricted cash at end of period 102,841,000 72,501,000 107,134,000
Supplemental cash flow information      
Cash paid for interest 41,501,000 53,503,000 50,672,000
Cash paid for income taxes - net 398,000 419,000 385,000
Operating lease payments in operating cash flows 44,173,000    
Supplemental non-cash operating activities      
Right-of-use assets obtained in exchange of lease liabilities 145,054,000    
Supplemental non-cash investing and financing activities      
Accrued capital expenditures $ 61,000 $ 179,000 16,677,000
Acquisition of finance leases     $ 10,473,000