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Legal, Environmental and Other Contingencies - Schedule of Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Sep. 30, 2018
Environmental post-closure monitoring and maintenance activities $ 504 $ 504
Long Term Obligations    
Maturities of long-term obligations (discounted)    
2020 52  
2021 59  
2022 49  
2023 48  
2024 and thereafter 241  
Long-term obligations (less current portion) $ 449