CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
OPERATING REVENUES
Utility	$ 219,623	$ 199,965
Nonutility	395,413	611,802
Total operating revenues	615,036	811,767
Gas purchases:
Gas purchases - Related parties	1,524	2,185
Operation and maintenance	63,345	63,343
Regulatory rider expenses	11,742	12,632
Depreciation and amortization	27,758	21,832
Total operating expenses	513,539	723,024
OPERATING INCOME	101,497	88,743
Other income, net	286	869
Interest expense, net of capitalized interest	16,070	13,486
INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES	85,713	76,126
Income tax benefit	(259)	(6,961)
Equity in earnings of affiliates	3,389	3,161
NET INCOME	$ 89,361	$ 86,248
EARNINGS PER COMMON SHARE
Basic (usd per share)	$ 0.97	$ 0.97
Diluted (usd per share)	$ 0.97	$ 0.97
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	91,911	88,547
Diluted (in shares)	92,320	88,946
Regulated
Gas purchases:
Gas purchases - Utility and Nonutility	$ 91,814	$ 87,649
Unregulated
Gas purchases:
Gas purchases - Utility and Nonutility	$ 317,356	$ 535,383