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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
Net income | $ 233,436 | $ 132,065 | $ 131,672
Adjustments to reconcile net income to cash flows from operating activities |  |  |
Unrealized loss (gain) on derivative instruments | 26,770 | (11,241) | 46,883
Gain on sale of available for sale securities | (5,332) | (7,287) | 0
Gain on sale of businesses | (4,663) | 0 | 0
Depreciation and amortization | 85,701 | 81,841 | 72,748
Amortization of acquired wholesale energy contracts | 18,222 | 762 | 0
Allowance for equity used during construction | (5,531) | (3,867) | (4,375)
Allowance for doubtful accounts | 2,579 | 2,023 | 1,616
Deferred income taxes | 15,590 | 41,442 | 27,721
Deferred income tax benefit due to tax legislation | (75,736) | 0 | 0
Manufactured gas plant remediation costs | (16,171) | (10,934) | (8,106)
Equity in earnings, net of distributions received from equity investees | (1,725) | (462) | 4,534
Cost of removal - asset retirement obligations | (298) | (484) | (403)
Contributions to postemployment benefit plans | (6,359) | (6,077) | (33,359)
Tax benefit of delivered shares from stock based compensation | 2,950 | 1,285 | 1,755
Changes in: |  |  |
Components of working capital | 97,004 | 17,081 | (123,325)
Other noncurrent assets | 17,860 | 13,978 | 3,933
Other noncurrent liabilities | 13,989 | (2,079) | 21,336
Cash flows from operating activities | 398,286 | 248,046 | 142,630
Expenditures for: |  |  |
Utility plant | (206,880) | (144,106) | (176,067)
Solar and wind equipment | (123,421) | (149,400) | (149,063)
Midstream and other | (6,644) | (2,434) | (1,896)
Cost of removal | (47,643) | (32,143) | (29,066)
Acquisition of retail and wholesale energy contracts | 0 | (55,661) | 0
Investments in equity investees | (16,151) | (27,070) | (11,176)
Distributions from equity investees in excess of equity in earnings | 3,117 | 2,749 | 2,351
Acquisition of retail and wholesale energy contracts | (10,000) | 0 | 0
(Deposits to) withdrawal from restricted cash construction fund | (9) | 1,322 | 979
Proceeds from sale of property, net of closing costs | 0 | 9,443 | 748
Proceeds from sale of businesses, net of closing costs | 27,916 | 0 | 0
Proceeds from sale of available for sale securities, net | 6,616 | 6,639 | 0
Cash flows used in investing activities | (373,099) | (390,661) | (363,190)
CASH FLOWS (USED IN) FROM FINANCING ACTIVITIES |  |  |
Proceeds from long-term debt | 225,000 | 100,000 | 275,000
Payments of long-term debt | (165,486) | (97,854) | (13,289)
(Payments of) proceeds from short-term debt, net | (114,050) | 144,300 | 55,350
Proceeds from sale-leaseback transaction - solar | 71,538 | 32,901 | 0
Proceeds from sale-leaseback transaction - gas meters | 7,820 | 9,587 | 7,107
Payments of common stock dividends | (95,835) | (87,988) | (82,445)
Proceeds from waiver discount issuance of common stock | 41,677 | 0 | 0
Proceeds from issuance of common stock | 17,136 | 17,492 | 16,010
Purchases of treasury stock | 0 | (6,355) | (1,008)
Tax withholding payments related to net settled stock compensation | (13,755) | (4,788) | (3,547)
Cash flows (used in) from financing activities | (25,955) | 107,295 | 253,178
Change in cash and cash equivalents | (768) | (35,320) | 32,618
Cash and cash equivalents at beginning of period | 2,226 | 37,546 | 4,928
Cash and cash equivalents at end of period | 1,458 | 2,226 | 37,546
CHANGES IN COMPONENTS OF WORKING CAPITAL |  |  |
Receivables | (7,524) | (56,974) | 11,303
Inventories | 15,464 | 3,022 | (45,986)
Recovery of gas costs | 30,439 | (90) | (39,642)
Gas purchases payable | 51,187 | 20,663 | (11,963)
Gas purchases payable - related parties | (1) | 2 | (411)
Prepaid and accrued taxes | 1,254 | 10,366 | 2,385
Accounts payable and other | 40,422 | 13,086 | (15,656)
Restricted broker margin accounts | (30,974) | 22,570 | (38,752)
Customers’ credit balances and deposits | 368 | (5,877) | 12,044
Other current assets | (3,631) | 10,313 | 3,353
Components of working capital | 97,004 | 17,081 | (123,325)
Cash paid (received) for: |  |  |
Interest (net of amounts capitalized) | 44,821 | 44,362 | 31,996
Income taxes | 5,577 | (6,877) | (3,516)
Accrued capital expenditures | 30,559 | 21,769 | 48,881
Inception gain on natural gas swap contract recognized as non-cash proceeds from sale of business | $ 14,579 | $ 0 | $ 0

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- Definition The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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- Definition Cash outflows made during the period for environmental remediation activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585 + Details
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- Definition Cash outflow related to disposal costs of plants, whether by demolishing, dismantling, abandoning, sale, and so forth during the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow for the purchase of or improvements to tangible or intangible assets, used to produce goods or deliver services, classified as other. + 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=109223946&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow for pension and other postretirement benefits. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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