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ASSET RETIREMENT OBLIGATIONS (Tables)
12 Months Ended
Sep. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Analysis of Change in ARO Liability
The following is an analysis of the change in the Company’s ARO for the fiscal years ended September 30:
(Thousands)20202019
NJNGNJRCEVNJNGNJRCEV
Balance at October 1$26,944 $4,102 $25,640 $3,048 
Accretion1,476 196 1,427 150 
Additions 1,306 135 904 
Change in estimated useful life (1,160)— — 
Change in assumptions1,104  — — 
Retirements(244) (258)— 
Other  — — 
Balance at period end$29,280 $4,444 $26,944 $4,102 
Schedule of Future Accretion
Accretion for the next five years, for the fiscal years ended September 30, is estimated to be as follows:
Estimated
(Thousands)Accretion
2021$1,717 
20221,789 
20231,869 
20241,948 
20252,029 
Total$9,352