CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
OPERATING REVENUES
Utility	$ 317,064	$ 295,546	$ 526,851	$ 481,102
Nonutility	701,979	438,000	1,197,497	793,472
Total operating revenues	1,019,043	733,546	1,724,348	1,274,574
OPERATING EXPENSES
Gas purchases - Utility	96,586	112,445	174,188	173,765
Gas purchases - Nonutility	621,223	367,328	1,066,307	705,260
Gas purchases - Related parties	2,087	2,072	4,236	4,183
Operation and maintenance	57,749	52,342	112,860	104,570
Regulatory rider expenses	19,604	19,893	31,373	32,494
Depreciation and amortization	22,460	20,328	44,314	39,588
Energy and other taxes	21,542	19,485	38,033	33,586
Total operating expenses	841,251	593,893	1,471,311	1,093,446
OPERATING INCOME	177,792	139,653	253,037	181,128
Other income, net	1,980	5,338	8,907	9,114
Interest expense, net of capitalized interest	11,798	11,436	23,703	22,051
INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES	167,974	133,555	238,241	168,191
Income tax provision (benefit)	30,901	23,932	(19,267)	25,950
Equity in earnings of affiliates	3,193	5,079	6,457	7,390
NET INCOME	$ 140,266	$ 114,702	$ 263,965	$ 149,631
EARNINGS PER COMMON SHARE
Basic (usd per share)	$ 1.60	$ 1.33	$ 3.02	$ 1.74
Diluted (usd per share)	1.59	1.32	3.01	1.72
DIVIDENDS DECLARED PER COMMON SHARE (usd per share)	$ 0.2725000	$ 0.255	$ 0.545	$ 0.51
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	87,595	86,275	87,295	86,182
Diluted (in shares)	87,989	87,101	87,690	86,993