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Legal, Environmental and Other Contingencies (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Sep. 30, 2021
Environmental post-closure monitoring and maintenance activities $ 566 $ 566
Maturities of long-term obligations (discounted)    
Long-term obligations (less current portion) 496 $ 566
Long Term Obligations    
Maturities of long-term obligations (discounted)    
2023 68  
2024 89  
2025 67  
2026 68  
2027 and thereafter 204  
Long-term obligations (less current portion) $ 496