CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
OPERATING REVENUES
Utility	$ 104,538	$ 121,362	$ 631,389	$ 602,464
Nonutility	438,897	336,161	1,636,394	1,129,633
Total operating revenues	543,435	457,523	2,267,783	1,732,097
OPERATING EXPENSES
Gas purchases - Utility	53,080	47,124	227,268	220,889
Gas purchases - Nonutility	422,734	299,971	1,489,041	1,005,231
Gas purchases - Related parties	2,156	2,076	6,392	6,259
Operation and maintenance	69,447	55,613	182,307	160,183
Regulatory rider expenses	5,542	5,216	36,915	37,710
Depreciation and amortization	20,320	20,760	64,634	60,348
Energy and other taxes	7,822	8,796	45,855	42,382
Total operating expenses	581,101	439,556	2,052,412	1,533,002
OPERATING (LOSS) INCOME	(37,666)	17,967	215,371	199,095
Other income, net	2,682	3,273	11,589	12,387
Interest expense, net of capitalized interest	11,037	11,164	34,740	33,215
(LOSS) INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES	(46,021)	10,076	192,220	178,267
Income tax (benefit) provision	(28,534)	(5,816)	(47,801)	20,134
Equity in earnings of affiliates	3,213	3,065	9,670	10,455
NET (LOSS) INCOME	$ (14,274)	$ 18,957	$ 249,691	$ 168,588
(LOSS) EARNINGS PER COMMON SHARE
Basic (usd per share)	$ (0.16)	$ 0.22	$ 2.85	$ 1.95
Diluted (usd per share)	(0.16)	0.22	2.84	1.94
DIVIDENDS DECLARED PER COMMON SHARE (usd per share)	$ 0.2725	$ 0.255	$ 0.8175	$ 0.765
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	87,888	86,408	87,493	86,257
Diluted (in shares)	87,888	87,267	87,884	87,088