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Asset Retirement Obligations (Tables)
12 Months Ended
Sep. 30, 2023
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of reconciliation of asset retirement obligations
The following is a reconciliation of these AROs (in thousands):
For the Fiscal Year Ended September 30,
20232022
Asset Retirement Obligations
Balance at beginning of year$2,858 $2,788 
   Liabilities incurred— — 
   Liabilities settled(502)— 
   Liabilities assumed — — 
   Accretion expense61 70 
Balance at end of year$2,417 $2,858