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INCOME TAXES - DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Deferred tax assets    
Investment tax credits $ 212,506 $ 225,036
State net operating losses 36,950 38,108
Fair value of derivatives 6,506 16,333
Impairment of equity method investment 14,124 15,395
Postemployment benefits 2,751 9,665
Incentive compensation 7,297 6,894
Amortization of intangibles 6,474 6,540
Overrecovered natural gas costs 4,977 1,540
Allowance for doubtful accounts 5,761 6,561
Other 5,748 6,140
Total deferred tax assets 303,094 332,212
Less: Valuation allowance (22,241) (23,613)
Total deferred tax assets net of valuation allowance 280,853 308,599
Deferred tax liabilities    
Property-related items (468,115) (419,753)
Remediation costs (18,490) (16,347)
Investments in equity investees (19,176) (21,739)
Conservation incentive plan (6,457) (3,309)
Other (4,615) (6,203)
Total deferred tax liabilities (516,853) (467,351)
Total net deferred tax liabilities (236,000) (158,752)
Tax credit carryforward 211,800 224,200
NJNG    
Deferred tax liabilities    
Tax credit carryforward $ 732 $ 814