DERIVATIVE INSTRUMENTS - OFFSETTING OF ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Energy Services
Derivative assets:
Amounts Presented in Balance Sheets	$ 42,520	$ 30,683
Offsetting Derivative Instruments	(15,922)	(12,619)
Financial Collateral Received/Pledged	(1,310)	(200)
Net Amounts	25,288	17,864
Derivative liabilities:
Amounts Presented in Balance Sheets	64,200	57,747
Offsetting Derivative Instruments	(15,922)	(12,619)
Financial Collateral Received/Pledged	0	0
Net Amounts	48,278	45,128
Energy Services | Physical commodity contracts
Derivative assets:
Amounts Presented in Balance Sheets	7,895	10,233
Offsetting Derivative Instruments	(1,698)	(404)
Financial Collateral Received/Pledged	(1,310)	(200)
Net Amounts	4,887	9,629
Derivative liabilities:
Amounts Presented in Balance Sheets	29,903	30,612
Offsetting Derivative Instruments	(1,698)	(404)
Financial Collateral Received/Pledged	0	0
Net Amounts	28,205	30,208
Energy Services | Financial commodity contracts
Derivative assets:
Amounts Presented in Balance Sheets	34,625	20,432
Offsetting Derivative Instruments	(14,224)	(12,198)
Financial Collateral Received/Pledged	0	0
Net Amounts	20,401	8,234
Derivative liabilities:
Amounts Presented in Balance Sheets	34,297	27,118
Offsetting Derivative Instruments	(14,224)	(12,198)
Financial Collateral Received/Pledged	0	0
Net Amounts	20,073	14,920
Energy Services | Foreign currency contracts
Derivative assets:
Amounts Presented in Balance Sheets		18
Offsetting Derivative Instruments		(17)
Financial Collateral Received/Pledged		0
Net Amounts		1
Derivative liabilities:
Amounts Presented in Balance Sheets		17
Offsetting Derivative Instruments		(17)
Financial Collateral Received/Pledged		0
Net Amounts		0
Natural Gas Distribution
Derivative assets:
Amounts Presented in Balance Sheets	5,603	337
Offsetting Derivative Instruments	(4,893)	(85)
Financial Collateral Received/Pledged	0	0
Net Amounts	710	252
Derivative liabilities:
Amounts Presented in Balance Sheets	7,381	6,292
Offsetting Derivative Instruments	(4,893)	(85)
Financial Collateral Received/Pledged	0	0
Net Amounts	2,488	6,207
Natural Gas Distribution | Physical commodity contracts
Derivative assets:
Amounts Presented in Balance Sheets	710	252
Offsetting Derivative Instruments	0	0
Financial Collateral Received/Pledged	0	0
Net Amounts	710	252
Derivative liabilities:
Amounts Presented in Balance Sheets	29	11
Offsetting Derivative Instruments	0	0
Financial Collateral Received/Pledged	0	0
Net Amounts	29	11
Natural Gas Distribution | Financial commodity contracts
Derivative assets:
Amounts Presented in Balance Sheets	4,893	85
Offsetting Derivative Instruments	(4,893)	(85)
Financial Collateral Received/Pledged	0	0
Net Amounts	0	0
Derivative liabilities:
Amounts Presented in Balance Sheets	7,352	6,281
Offsetting Derivative Instruments	(4,893)	(85)
Financial Collateral Received/Pledged	0	0
Net Amounts	$ 2,459	$ 6,196