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DERIVATIVE INSTRUMENTS - OFFSETTING OF ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Energy Services
Derivative assets:
Amounts Presented in Balance Sheets	$ 27,198	$ 30,683
Offsetting Derivative Instruments	(15,079)	(12,619)
Financial Collateral Received/Pledged	(460)	(200)
Net Amounts	11,659	17,864
Derivative liabilities:
Amounts Presented in Balance Sheets	41,527	57,747
Offsetting Derivative Instruments	(15,079)	(12,619)
Financial Collateral Received/Pledged	0	0
Net Amounts	26,448	45,128
Energy Services | Physical commodity contracts
Derivative assets:
Amounts Presented in Balance Sheets	4,266	10,233
Offsetting Derivative Instruments	(1,060)	(404)
Financial Collateral Received/Pledged	(460)	(200)
Net Amounts	2,746	9,629
Derivative liabilities:
Amounts Presented in Balance Sheets	27,508	30,612
Offsetting Derivative Instruments	(1,060)	(404)
Financial Collateral Received/Pledged	0	0
Net Amounts	26,448	30,208
Energy Services | Financial commodity contracts
Derivative assets:
Amounts Presented in Balance Sheets	22,932	20,432
Offsetting Derivative Instruments	(14,019)	(12,198)
Financial Collateral Received/Pledged	0	0
Net Amounts	8,913	8,234
Derivative liabilities:
Amounts Presented in Balance Sheets	14,019	27,118
Offsetting Derivative Instruments	(14,019)	(12,198)
Financial Collateral Received/Pledged	0	0
Net Amounts	0	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	100	337
Offsetting Derivative Instruments	(1)	(85)
Financial Collateral Received/Pledged	0	0
Net Amounts	99	252
Derivative liabilities:
Amounts Presented in Balance Sheets	24	6,292
Offsetting Derivative Instruments	(1)	(85)
Financial Collateral Received/Pledged	0	0
Net Amounts	23	6,207
Natural Gas Distribution | Physical commodity contracts
Derivative assets:
Amounts Presented in Balance Sheets	100	252
Offsetting Derivative Instruments	(1)	0
Financial Collateral Received/Pledged	0	0
Net Amounts	99	252
Derivative liabilities:
Amounts Presented in Balance Sheets	24	11
Offsetting Derivative Instruments	(1)	0
Financial Collateral Received/Pledged	0	0
Net Amounts	$ 23	11
Natural Gas Distribution | Financial commodity contracts
Derivative assets:
Amounts Presented in Balance Sheets		85
Offsetting Derivative Instruments		(85)
Financial Collateral Received/Pledged		0
Net Amounts		0
Derivative liabilities:
Amounts Presented in Balance Sheets		6,281
Offsetting Derivative Instruments		(85)
Financial Collateral Received/Pledged		0
Net Amounts		$ 6,196

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