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Legal, Environmental and Other Contingencies (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Environmental post-closure monitoring and maintenance activities $ 602 $ 602
Maturities of long-term obligations (discounted)    
Long-term obligations (less current portion) 525 $ 602
Long Term Obligations    
Maturities of long-term obligations (discounted)    
2022 67  
2023 65  
2024 87  
2025 65  
2026 and thereafter 241  
Long-term obligations (less current portion) $ 525