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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Cash flows from operating activities: |  |  |
Net income | $ 47,580,000 | $ 33,255,000 | $ 32,828,000
Adjustments to reconcile net income to net cash flows provided by operating activities: |  |  |
Depreciation and amortization | 77,994,000 | 65,031,000 | 61,048,000
Stock compensation expense | 5,508,000 | 12,929,000 | 1,288,000
Deferred income taxes | 15,503,000 | (17,874,000) | 20,515,000
Amortization of unfavorable lease liabilities and deferred credits | (10,839,000) | (11,035,000) | (10,626,000)
Amortization of debt financing costs and accretion of interest on non-interest-bearing subordinated notes | 4,203,000 | 4,606,000 | 2,689,000
Loss on extinguishment of debt | 3,616,000 |  |
(Gain)/loss on disposal of assets | (5,000) | 307,000 | 533,000
Provision for obsolete expendable parts and supplies | 642,000 | 200,000 | 419,000
Lease termination | 9,540,000 | 15,109,000 |
Provision for doubtful accounts |  |  | (86,000)
Changes in assets and liabilities: |  |  |
Receivables | (9,275,000) | (5,437,000) | 530,000
Expendable parts and supplies | (6,310,000) | (744,000) | (3,379,000)
Prepaid expenses and other current assets | (713,000) | 7,584,000 | (17,243,000)
Accounts payable | 12,119,000 | 2,427,000 | (17,336,000)
Accrued liabilities | 2,113,000 | 12,581,000 | 3,547,000
Net cash provided by operating activities | 151,676,000 | 118,939,000 | 74,727,000
Cash flows used in investing activities: |  |  |
Capital expenditures | (125,350,000) | (117,989,000) | (84,500,000)
Purchases of investment securities | (14,884,000) | (19,921,000) |
Sales of investment securities | 34,961,000 |  |
Proceeds from sale of rotable spare parts |  |  | 18,000
Net returns (payments) of lease and equipment deposits | 431,000 | (653,000) | 406,000
Net cash used in investing activities | (104,842,000) | (138,563,000) | (84,076,000)
Cash flows from financing activities: |  |  |
Proceeds from long-term debt | 171,658,000 | 187,703,000 | 185,912,000
Principal payments on long-term debt and capital leases | (244,087,000) | (222,153,000) | (152,995,000)
Debt financing costs | (5,680,000) | (5,852,000) | (3,377,000)
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 | (1,871,000) | (4,993,000) | (1,043,000)
Net cash (used in) provided by financing activities | (81,467,000) | 66,411,000 | 28,497,000
Net change in cash and cash equivalents | (34,633,000) | 46,787,000 | 19,148,000
Cash and cash equivalents and restricted cash at beginning of period | 107,134,000 | 60,347,000 | 41,199,000
Cash and cash equivalents and restricted cash at end of period | 72,501,000 | 107,134,000 | 60,347,000
Supplemental cash flow information |  |  |
Cash paid for interest | 53,503,000 | 50,672,000 | 43,798,000
Cash paid for income taxes - net | 419,000 | 385,000 | 332,000
Supplemental non-cash investing and financing activities |  |  |
Accrued capital expenditures | $ 179,000 | 16,677,000 | $ 9,533,000
Acquisition of capital leases |  | $ 10,473,000 |

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- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The cash outflow for loan and debt issuance costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow for purchase of marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 + Details
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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- Definition Amount of cash outflow for debt, mandatory redeemable security, and principal payment for finance lease obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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