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INVESTMENTS IN EQUITY INVESTEES (Details) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 30, 2020 phase mi	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) mi	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in equity investees		$ 117,016		$ 117,016		$ 208,375
Deferred tax gross up						4,600
Other than temporary impairment		92,000	$ 0	$ 92,000	$ 0
Other than temporary impairment, net of tax		$ 72,700
PennEast | NJR Pipeline
Schedule of Equity Method Investments [Line Items]
Ownership percentage		20.00%		20.00%
Steckman Ridge
Schedule of Equity Method Investments [Line Items]
Investments in equity investees		$ 111,537		$ 111,537		112,378
Total outstanding principal balance of loans		$ 70,400		$ 70,400		70,400
Ownership percentage		50.00%		50.00%
PennEast
Schedule of Equity Method Investments [Line Items]
Investments in equity investees		$ 5,479		$ 5,479		$ 95,997
Ownership percentage		20.00%		20.00%
Construction plan, project area (in miles) | mi	68			120
Number of phases | phase	2

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