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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Operating Activities      
Net Income (Loss) Available for Common Stock $ 391,521 $ 283,482 $ (290,958)
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities:      
Impairment of Oil and Gas Producing Properties 0 0 948,307
Depreciation, Depletion and Amortization 240,961 224,195 249,417
Deferred Income Taxes (18,153) 117,975 (246,794)
Excess Tax Benefits Associated with Stock-Based Compensation Awards 0 0 (1,868)
Stock-Based Compensation 15,762 12,262 5,755
Other 16,133 16,476 12,620
Change in:      
Hedging Collateral Deposits (1,700) (257) 9,640
Receivables and Unbilled Revenue (30,882) (3,380) (6,408)
Gas Stored Underground and Materials and Supplies (4,021) (1,417) (3,532)
Unrecovered Purchased Gas Costs 419 (2,183) (2,440)
Other Current Assets (16,519) 7,849 3,179
Accounts Payable 17,962 17,192 (40,664)
Amounts Payable to Customers 3,394 (19,537) (37,241)
Customer Advances (2,092) 939 (1,474)
Customer Security Deposits 5,331 4,353 (471)
Other Accruals and Current Liabilities 3,865 27,004 3,453
Other Assets (9,556) (2,885) 1,941
Other Liabilities 1,178 2,183 (13,483)
Net Cash Provided by Operating Activities 613,603 684,251 588,979
Investing Activities      
Capital Expenditures (584,004) (450,335) (581,576)
Net Proceeds from Sale of Oil and Gas Producing Properties 55,506 26,554 137,316
Other (389) 1,216 (9,236)
Net Cash Used in Investing Activities (528,887) (422,565) (453,496)
Financing Activities      
Excess Tax Benefits Associated with Stock-Based Compensation Awards 0 0 1,868
Net Proceeds from Issuance of Long-Term Debt 295,020 295,151 0
Reduction of Long-Term Debt (566,512) 0 0
Net Proceeds from Issuance of Common Stock 4,110 7,784 13,849
Dividends Paid on Common Stock (143,258) (139,063) (134,824)
Net Cash Provided by (Used in) Financing Activities (410,640) 163,872 (119,107)
Net Increase (Decrease) in Cash and Temporary Cash Investments (325,924) 425,558 16,376
Cash and Temporary Cash Investments At Beginning of Year 555,530 129,972 113,596
Cash and Temporary Cash Investments At End of Year 229,606 555,530 129,972
Supplemental Disclosure of Cash Flow Information      
Cash Paid for Interest 126,079 116,894 119,563
Cash Paid for Income Taxes 31,771 34,826 34,240
Supplemental Disclosure of Cash Flow Information, Non-Cash Investing Activities      
Non-Cash Capital Expenditures 88,813 72,216 60,434
Receivable from Sale of Oil and Gas Producing Properties $ 0 $ 0 $ 19,543