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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 396,421 $ 350,104 $ 315,075
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 319,633 293,096 274,796
Deferred income taxes 227,183 193,556 192,886
Gain on sale of discontinued operations 12,931 0 0
Gain (Loss) on discontinuance of cash flow hedging of natural gas marketing commodity contracts reclassified from AOCI 10,579 0 0
Stock-based compensation 14,064 14,760 15,980
Debt financing costs 6,469 5,667 5,922
Other 97 1,019 359
Changes in assets and liabilities:      
(Increase) decreased in accounts receivable (58,696) (4,847) 48,240
Decrease in gas stored underground (35,126) 20,577 33,234
(Increase) decrease in other current assets 9,991 (18,739) (11,951)
(Increase) decrease in deferred charges and other assets 102,254 (24,860) 51,614
Increase (decrease) in account payable and accrued liabilities 53,017 (5,195) (59,112)
Increase (decrease) in other current liabilities (78,651) (44,482) 896
Increase (decrease) in deferred credits and other liabilities (66,056) 14,334 (56,025)
Net cash provided by operating activities 867,090 794,990 811,914
CASH FLOWS USED IN INVESTING ACTIVITIES      
Capital expenditures (1,137,089) (1,086,950) (963,621)
Acquisition (86,128) 0 0
Proceeds from sale of discontinued operations 140,253 0 0
Payments to Acquire Available-for-sale Securities (53,597) (32,551) (29,527)
Proceeds from Sale of Available-for-sale Securities 31,792 27,019 24,889
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities 9,332 6,290 6,235
Proceeds From Use Tax Refund, Investing Activities 29,790 0 0
Other, net 9,341 6,460 5,422
Net cash used in investing activities (1,056,306) (1,079,732) (956,602)
CASH FLOWS FROM FINANCING ACTIVITIES      
Net increase (decrease) in short-term debt (382,066) 371,884 261,232
Proceeds from issuance of long-term debt 884,911 0 499,060
Net proceeds from equity offering 98,755 98,574 0
Issuance of common stock through stock purchase and employee retirement plans 26,523 34,278 30,952
Settlement of interest rate agreement (36,996) 0 13,364
Interest rate agreements cash collateral 25,670 (25,670) 0
Repayment of long-term debt (250,000) 0 (500,000)
Cash dividends paid (191,931) (175,126) (160,018)
Repurchase of equity awards 0 0 (7,985)
Other (6,775) (317) (5,522)
Net cash provided by (used in) financing activities 168,091 303,623 131,083
Net increase (decrease) in cash and cash equivalents (21,125) 18,881 (13,605)
Cash and cash equivalents at beginning of period 47,534 28,653 42,258
Cash and cash equivalents at end of period 26,409 47,534 28,653
CASH PAID (RECEIVED) DURING THE PERIOD FOR:      
Interest 156,668 154,748 151,334
Income taxes $ 5,264 $ 7,794 $ 1,802