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Legal, Environmental and Other Contingencies (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Sep. 30, 2019
Environmental post-closure monitoring and maintenance activities $ 606 $ 606
Maturities of long-term obligations (discounted)    
Long-term obligations (less current portion) 508 $ 606
Long Term Obligations    
Maturities of long-term obligations (discounted)    
2021 74  
2022 64  
2023 81  
2024 60  
2025 and thereafter 229  
Long-term obligations (less current portion) $ 508