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REVENUE - TIMING OF REVENUE RECOGNITION - BALANCE SHEET (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Billed	$ 128,264	$ 97,540
Unbilled	20,564	19,100
Customers' credit balances and deposits	(28,881)	(44,910)	$ (30,267)	$ (33,246)
Customers accounts receivables & Customers' credit balances and deposits	119,947	71,730
Operating Segments | NJNG
Disaggregation of Revenue [Line Items]
Billed	84,923	55,234
Unbilled	12,778	10,784
Customers' credit balances and deposits	(28,860)	(44,898)
Customers accounts receivables & Customers' credit balances and deposits	68,841	21,120
Operating Segments | CEV
Disaggregation of Revenue [Line Items]
Billed	8,819	9,962
Unbilled	7,786	8,316
Customers' credit balances and deposits	0	0
Customers accounts receivables & Customers' credit balances and deposits	16,605	18,278
Operating Segments | ES
Disaggregation of Revenue [Line Items]
Billed	23,509	23,716
Unbilled	0	0
Customers' credit balances and deposits	0	0
Customers accounts receivables & Customers' credit balances and deposits	23,509	23,716
Operating Segments | S&T
Disaggregation of Revenue [Line Items]
Billed	8,360	6,577
Unbilled	0	0
Customers' credit balances and deposits	(21)	(12)
Customers accounts receivables & Customers' credit balances and deposits	8,339	6,565
Corporate, Non-Segment
Disaggregation of Revenue [Line Items]
Billed	2,653	2,051
Unbilled	0	0
Customers' credit balances and deposits	0	0
Customers accounts receivables & Customers' credit balances and deposits	$ 2,653	$ 2,051

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