CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
OPERATING REVENUES
Utility	$ 195,729	$ 219,623
Nonutility	258,576	395,413
Total operating revenues	454,305	615,036
Natural gas purchases:
Gas purchases - Related parties	1,734	1,524
Operation and maintenance	73,636	63,345
Regulatory rider expenses	10,701	11,742
Depreciation and amortization	27,362	24,637
Total operating expenses	342,825	510,418
OPERATING INCOME	111,480	104,618
Other income, net	4,117	286
Interest expense, net of capitalized interest	19,786	16,070
INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES	95,811	88,834
Income tax provision	17,441	16,471
Equity in earnings of affiliates	2,675	3,389
NET INCOME	$ 81,045	$ 75,752
EARNINGS PER COMMON SHARE
Basic (usd per share)	$ 0.84	$ 0.82
Diluted (usd per share)	$ 0.84	$ 0.82
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	96,114	91,911
Diluted (in shares)	96,415	92,320
Regulated
Natural gas purchases:
Gas purchases - Utility and Nonutility	$ 56,145	$ 91,814
Unregulated
Natural gas purchases:
Gas purchases - Utility and Nonutility	$ 173,247	$ 317,356