CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Jun. 30, 2019	Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	[1]	$ 151,419	$ 249,691
Adjustments to reconcile net income to cash flows from operating activities
Unrealized (gain) loss on derivative instruments		(25,353)	25,904
Realized and unrealized gains on investments in equity securities		(1,567)	(5,332)
Gain on sale of businesses		(645)	(4,687)
Depreciation and amortization		67,292	64,634
Amortization of acquired wholesale energy contracts		7,813	17,813
Allowance for equity used during construction		(6,135)	(3,730)
Allowance for doubtful accounts		1,686	1,672
Deferred income taxes		(29,092)	17,351
Deferred income tax benefit due to the Tax Act		0	(73,784)
Manufactured gas plant remediation costs		(9,582)	(13,624)
Equity in earnings, net of distributions received from equity investees		(2,700)	(935)
Cost of removal - asset retirement obligations		(194)	(93)
Contributions to postemployment benefit plans		(5,994)	(4,708)
Tax benefit from stock-based compensation		1,289	2,841
Changes in:
Components of working capital		(14,829)	64,527
Other noncurrent assets		16,906	41,793
Other noncurrent liabilities		15,476	13,224
Cash flows from operating activities		165,790	392,557
Expenditures for:
Utility plant		(207,357)	(130,727)
Solar equipment		(91,333)	(88,416)
Midstream and other		(13,116)	(4,879)
Cost of removal		(32,212)	(42,683)
Distribution from equity investees in excess of equity in earnings		1,473	2,515
Investments in equity investees		(2,696)	(14,496)
Cash paid related to acquisition		0	(10,000)
Proceeds from sale of businesses, net of closing costs		205,745	27,916
Proceeds from sale of investments in equity securities, net		34,484	6,616
Cash flows used in investing activities		(105,012)	(254,154)
CASH FLOWS USED IN FINANCING ACTIVITIES
Proceeds from long-term debt		35,800	225,000
Payments of long-term debt		(15,001)	(133,717)
Payments of short-term debt, net		(52,650)	(208,900)
Proceeds from sale-leaseback transaction		9,895	7,820
Payments of common stock dividends		(77,730)	(71,334)
Proceeds from waiver discount issuance of common stock		57,391	41,677
Proceeds from issuance of common stock		13,199	13,572
Tax withholding payments related to net settled stock compensation		(6,704)	(13,625)
Cash flows used in financing activities		(35,800)	(139,507)
Change in cash, cash equivalents and restricted cash		24,978	(1,104)
Cash, cash equivalents and restricted cash at beginning of period		1,710	2,469
Cash, cash equivalents and restricted cash at end of period		26,688	1,365
CHANGES IN COMPONENTS OF WORKING CAPITAL
Receivables		28,385	(5,757)
Inventories		51,833	63,838
Recovery of gas costs		(14,870)	28,524
Gas purchases payable		(66,060)	28,041
Prepaid and accrued taxes		10,110	(22,993)
Accounts payable and other		(31,883)	5,213
Restricted broker margin accounts		13,092	(29,497)
Customers' credit balances and deposits		(7,832)	(745)
Other current assets		2,396	(2,097)
Components of working capital		(14,829)	64,527
Cash paid for:
Interest (net of amounts capitalized)		42,107	35,295
Income taxes		8,550	4,195
Accrued capital expenditures		32,143	30,019
Inception gain on natural gas swap contract recognized as non-cash proceeds from sale of business		$ 0	$ 14,579

[1] Includes income tax benefit related to the Tax Act of $844,000 and $57.7 million, for the three and nine months ended June 30, 2018, respectively.