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REVENUE - TIMING OF REVENUE RECOGNITION - BALANCE SHEET (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Billed	$ 370,965	$ 222,297
Customers' credit balances and deposits	(40,970)	(33,246)	$ (38,666)	$ (32,586)
Customers accounts receivables & Customers' credit balances and deposits	439,142	202,820
Billed
Disaggregation of Revenue [Line Items]
Billed	370,965	222,297	266,815	212,838
Unbilled
Disaggregation of Revenue [Line Items]
Billed	109,147	13,769	$ 72,949	$ 10,351
Operating Segments | Natural Gas Distribution
Disaggregation of Revenue [Line Items]
Customers' credit balances and deposits	(40,967)	(33,246)
Customers accounts receivables & Customers' credit balances and deposits	213,242	56,076
Operating Segments | Natural Gas Distribution | Billed
Disaggregation of Revenue [Line Items]
Billed	147,629	78,508
Operating Segments | Natural Gas Distribution | Unbilled
Disaggregation of Revenue [Line Items]
Billed	106,580	10,814
Operating Segments | Clean Energy Ventures
Disaggregation of Revenue [Line Items]
Customers' credit balances and deposits	0	0
Customers accounts receivables & Customers' credit balances and deposits	8,075	8,521
Operating Segments | Clean Energy Ventures | Billed
Disaggregation of Revenue [Line Items]
Billed	5,508	5,566
Operating Segments | Clean Energy Ventures | Unbilled
Disaggregation of Revenue [Line Items]
Billed	2,567	2,955
Operating Segments | Energy Services
Disaggregation of Revenue [Line Items]
Customers' credit balances and deposits	0	0
Customers accounts receivables & Customers' credit balances and deposits	206,374	129,199
Operating Segments | Energy Services | Billed
Disaggregation of Revenue [Line Items]
Billed	206,374	129,199
Operating Segments | Energy Services | Unbilled
Disaggregation of Revenue [Line Items]
Billed	0	0
Operating Segments | Storage and Transportation
Disaggregation of Revenue [Line Items]
Customers' credit balances and deposits	(3)	0
Customers accounts receivables & Customers' credit balances and deposits	9,347	7,012
Operating Segments | Storage and Transportation | Billed
Disaggregation of Revenue [Line Items]
Billed	9,350	7,012
Operating Segments | Storage and Transportation | Unbilled
Disaggregation of Revenue [Line Items]
Billed	0	0
Home Services and Other
Disaggregation of Revenue [Line Items]
Customers' credit balances and deposits	0	0
Customers accounts receivables & Customers' credit balances and deposits	2,104	2,012
Home Services and Other | Billed
Disaggregation of Revenue [Line Items]
Billed	2,104	2,012
Home Services and Other | Unbilled
Disaggregation of Revenue [Line Items]
Billed	$ 0	$ 0

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