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DERIVATIVE INSTRUMENTS - OFFSETTING OF ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Energy Services
Derivative assets:
Amounts Presented in Balance Sheets	$ 20,481	$ 26,510
Offsetting Derivative Instruments	(18,262)	(17,982)
Financial Collateral Received/Pledged	1,230	(200)
Net Amounts	3,449	8,328
Derivative liabilities:
Amounts Presented in Balance Sheets	56,673	46,859
Offsetting Derivative Instruments	(18,262)	(17,982)
Financial Collateral Received/Pledged	0	0
Net Amounts	38,411	28,877
Energy Services | Physical commodity contracts
Derivative assets:
Amounts Presented in Balance Sheets	4,733	7,718
Offsetting Derivative Instruments	(2,693)	(3,587)
Financial Collateral Received/Pledged	(200)	(200)
Net Amounts	1,840	3,931
Derivative liabilities:
Amounts Presented in Balance Sheets	35,620	32,441
Offsetting Derivative Instruments	(2,693)	(3,587)
Financial Collateral Received/Pledged		0
Net Amounts	32,927	28,854
Energy Services | Financial commodity contracts
Derivative assets:
Amounts Presented in Balance Sheets	15,490	18,708
Offsetting Derivative Instruments	(15,490)	(14,311)
Financial Collateral Received/Pledged	1,430	0
Net Amounts	1,430	4,397
Derivative liabilities:
Amounts Presented in Balance Sheets	20,974	14,311
Offsetting Derivative Instruments	(15,490)	(14,311)
Financial Collateral Received/Pledged		0
Net Amounts	5,484	0
Energy Services | Foreign currency contracts
Derivative assets:
Amounts Presented in Balance Sheets	258	84
Offsetting Derivative Instruments	(79)	(84)
Financial Collateral Received/Pledged		0
Net Amounts	179	0
Derivative liabilities:
Amounts Presented in Balance Sheets	79	107
Offsetting Derivative Instruments	(79)	(84)
Financial Collateral Received/Pledged		0
Net Amounts	0	23
Natural Gas Distribution
Derivative assets:
Amounts Presented in Balance Sheets	93	149
Offsetting Derivative Instruments	(6)	(136)
Financial Collateral Received/Pledged	0	0
Net Amounts	87	13
Derivative liabilities:
Amounts Presented in Balance Sheets	2,029	358
Offsetting Derivative Instruments	(6)	(136)
Financial Collateral Received/Pledged	0	0
Net Amounts	2,023	222
Natural Gas Distribution | Physical commodity contracts
Derivative assets:
Amounts Presented in Balance Sheets	87	78
Offsetting Derivative Instruments		(65)
Financial Collateral Received/Pledged		0
Net Amounts	87	13
Derivative liabilities:
Amounts Presented in Balance Sheets	2	76
Offsetting Derivative Instruments		(65)
Financial Collateral Received/Pledged		0
Net Amounts	2	11
Natural Gas Distribution | Financial commodity contracts
Derivative assets:
Amounts Presented in Balance Sheets	6	71
Offsetting Derivative Instruments	(6)	(71)
Financial Collateral Received/Pledged		0
Net Amounts	0	0
Derivative liabilities:
Amounts Presented in Balance Sheets	2,027	282
Offsetting Derivative Instruments	(6)	(71)
Financial Collateral Received/Pledged		0
Net Amounts	$ 2,021	$ 211

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